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50 IB Biology IA Ideas

How To Write a Perfect Biology IA

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IB Biology IA ideas (30+ topics) - A Goldmine You Can't Ignore.

Unleash your potential in IB Biology with our exclusive list of 30+ captivating IA ideas! Discover the secrets to scoring top marks & nail your IA now!

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Sitting in that quiet corner, sipping hot chocolate, hoping it rains IB Biology IA ideas, instead, going blank and utterly confused?

We don't want that to happen, do we? 

Choosing the perfect IB Biology IA idea is only the first step in making one's IB Biology Investigation, but definitely, the most significant. IB Biology IA Ideas won't strike out of the blue, but here's a list of  30+ IB Biology IA ideas  to inspire and stimulate your grey cells! Selecting an IBxq Biology IA idea has always been challenging! 

Before we look for IB Biology IA ideas, let's clearly comprehend the  IB Biology Diploma Programme Subject , its objectives, partwise breakdown, and what IB expects of you.

The IB IAs are essential to one's overall subject performance since they make up 20% of the final score. Internal Assessments are the perfect way to get students to put their knowledge to use by Observing, Questioning, and Investigating.   Personal engagement ,  Exploration ,  Analysis ,  Evaluation ,  and   Communication  are the criteria against which the investigation is assessed.            

The sure-shot way to ace one's IB Biology IA, or any IA, is by picking a topic that sparks one's interest. A well-planned , structured, and executed  IA has been undertaken with zeal and enthusiasm. It is all the same when choosing that one Biology IA idea from a platter full of inspiration. 

Before we dive more in-depth, you should check out our  premium IB Biology SL Notes  to own your Biology SL papers! Along with a bundle of  Past Papers , these  premium SL notes  include guides for your  Extended Essay  and  Internal Assessments  with helpful examples! You certainly want to take advantage of these! Browse  these  for more information! 

When it comes to selecting from several IB Biology IA ideas for your investigation, it is essential to note that your IA would either require you to:

• Carry out experimental research in the laboratory or
• Draw interpretation from a credible database or
• Make a detailed analysis using a simulation/modelling.

Either way, you must connect to your topic and portray personal engagement as it lays the foundation for the rest of your investigation. Proper research is a bare minimum, and the rest follows. Here's a quick summary of how you are supposed to choose an appropriate IB Biology IA idea for your report:

• Know your interest:  Go through several IA ideas to understand what all topics are in sync with the IB Biology curriculum and if something grabs your attention, hold on to it!
• Keep it specific:  The idea should be more generic and more complex. An ideal IA idea reeks of originality and leaves room for proper investigation and analysis.
• Let it be realistic:  Outline the Equipment, time, and resources to check its feasibility.

Tada! There you go! 

Now that you know how to settle on that one perfect topic, let's quickly brief ourselves on the proper planning and procedure involved in the making of an IB Biology IA:

Concise Research Question:  

Your Research Question and the Aim of the Investigation are separate sub-headings with different implications. Keep the research question brief and relevant. The Aim answers Why while the Research Question answers the What.

• It is essential to set the Research Question in the background of the chosen topic. My Background, IB expects you to briefly explain what encouraged you to select a particular topic and, hopefully, a personal story that validates your choice and engagement. For instance, if you choose to investigate how light levels affect the predation of peppered moths, you could set a background that you have gained a fascination for that species ever since it was introduced to you for some explanation in your regular classes and eventually give more scientific basis for your choice.
• Independent, Dependent variables need to be highlighted, as should the hypothesis. State your hypothesis; it is important in the context of your research. Constraints, if any, need to be mentioned as well. Remember, the Independent variable is one that you are allowed to change(just one); the Dependent variable is one that you measure as it changes with the Independent variable; all the other experiment conditions must be kept constant to ensure that the experiment is fair.
• The procedure used should be well structured.
• Tables, Graphs, etc., should be used.
• Perform the relevant analysis, consider the research question, and conclude. 
• Limitations and Improvements should be specified.

Acknowledging the safety protocols established by IB and considering the ethical aspects of your investigation is imperative. 

Focus on the question:

"If there are any ethical implications to your report, how do you plan on minimizing the environmental impact of your experiment?" 

Citing documents/web pages and giving references is another crucial aspect of your IA that needs to be taken care of. 

An important thing to note here is that although you are allowed to take inspiration from existing research, papers/journals, you are expected to give a novel perspective to the idea while producing it in your investigation.

For example, an idea inspired by how the soil pH affects seed germination could be investigated in a new light; think of other factors controlling/affecting seed germination. You could progress further in your report with a focus on quantitative data.

With all the necessary information at your disposal, it is time to present some fantastic IB Biology IA ideas to encourage you to put your thinking caps on and take on the challenge with newfound zeal! These ideas are meant to give you a little head start along this path; your final IB Biology Investigation idea is your interpretation of one.

Without further adieu, let's dive headfirst into  30+ IB Biology IA ideas  for your Biology IA Investigation!

• Reference to Course:   Molecular Biology  (Metabolism, Cell Respiration, Photosynthesis)
• Lab, Simulation-based
• Reference to Course:  Molecular Biology (Metabolism, Cell Respiration, Photosynthesis)
• Experimental 
• Reference to Course:  Cell Biology (Membrane Structure)
• Experimental
• Reference to Course:  Plant Biology
• Reference to Course:  Molecular Biology (Enzymes)
• Reference to Course:  Cell Biology
• Simulation/Modelling
• Reference to Course:  Cell Biology (Osmosis)
• Database based
• Reference to Course:   Molecular Biology (Enzymes)
• Reference to Course:  Ecology
• Reference to Course:  Microbiology
• Reference to Course:  Molecular Biology(Enzymes)
• Experimental, Simulation-based
• Reference to Course:  Buffers
• Reference to Course:  Human Physiology
• Reference to Course:  Molecular Biology(Enzymes)
• Simulation Analysis
• Database, Experimental
• Reference to Course:  Plants Physiology

These ideas are for you to start exploring and begin! Take inspiration from these and research further to land on that one idea that gets you going!

But is that it? Certainly not! 

Here are a couple of other ideas you could browse and eventually take inspiration from:

• Effect of Different Fertilizers on  Eutrophication .
• Analyzing Milk Spoilage under varying conditions of Temperature, Sunlight, etc.
• Exploring how a particular variable affects the  germination of seeds .
• Investigating the rate of oxygen production of seaweed with variation in light intensity.
• To prevent microbial growth, explore better ways to clean household items(for example - mats).
• Studying the effect of temperature on photosynthesis in Green Gram(Vigna Radiata).
• Understanding what effect different ethanol concentrations have on cell membranes.
• Studying the biology behind  Schizophrenia .
• Investigating the decay time of different  Genetically Modified Foods .
• Understanding the impact of different variables on vegetable decay/ Exploring other methods to prevent vegetable decay.

And that's that!

These little ideas will help you brainstorm and explore further the vast yet intriguing expanse of biology. IB Biology curriculum expects you to appreciate scientific problems in a global context with stimulating opportunities, and IB Biology IAs help you accomplish just that. It might seem like a lot of work, but with the right topic, you will surpass your expectations! On this note, we wish you all the very best for your IB Biology IA Journey :)

Want some A-quality guidance? Look no further; at Nail IB, we have assembled premium content for you to ace your IBs, and you should check out our resources for a smooth IB experience. Click  here  for top-notch IB resources or to assess how your prep is going! 

This article will be a foundation for you to get going on that IB Biology IA Investigation of yours!  

IB Resources you will love!

50 Biology IA Topics: Essential Selections for Learners

What is Biology IA

What are the Essential Components of the IA

Biology IA Topics

How Can I Prepare for a Biology IA

Final words.

I've witnessed firsthand the transformative power of engaging with the right research question in biology. Drawing from years of experience and a deep understanding of the subject, I've curated a list of 50 Biology IA topics to guide students and researchers alike. This compilation is more than just a list; it's a bridge connecting curious minds to the vast and intricate world of biological sciences. Each topic has been carefully selected for its potential to challenge, inspire, and contribute to our growing body of knowledge. Whether you're exploring the microscopic intricacies of cell biology or the complex ecosystems that sustain life on Earth, these topics are designed to foster a profound appreciation for the living world and its phenomena.

What is Biology IA (Internal Assessment) ?

The IA involves the submission of a lab report by students as part of their IB biology curriculum. Until May 2025, the report must be between 6 and 12 pages, encompassing a research question, methodology, data analysis, and a conclusion. Starting from May 2025, the report's length will be capped at 3,000 words.

IA should begin with a research question that is not only testable but also deeply rooted in the biology syllabus. This question must be closely aligned with the curriculum, precisely defined, and specific. In the methodology section, a detailed account of the research process, including the materials and methods utilized, should be provided. This section must be thorough, clearly describing the research steps, resources employed, and any ethical considerations addressed. Analyzing the gathered data is a critical phase of the IA. Students are expected to organize their data neatly and apply suitable statistical methods for analysis, interpreting their findings accurately. They should also discuss any study limitations and the broader significance of their results. The conclusion should encapsulate the study's key outcomes, linking them directly to the initial research question, and suggest areas for future investigation. Moreover, students must submit a reflective statement as part of their IA. This narrative, approximately 500 words, should ponder the student's learning journey throughout the IA process. It should cover the student's personal experiences, highlighting both triumphs and obstacles faced, assess their performance and the competencies developed during the assessment, and provide a thoughtful evaluation of the entire experience. Throughout this process, students may find tools like " essay typer free " helpful in articulating their thoughts and insights effectively.

List of 50 Biology IA Topics

• Deep Dive into the Syllabus: Start by thoroughly understanding the IB Biology syllabus. Knowing the curriculum inside out helps you identify areas that interest you and align with the IA requirements. It also ensures that your research question is relevant and grounded in the course content.
• Practice Lab Report Writing: Enhance your lab report writing skills by practicing regularly. Familiarize yourself with the structure and conventions of scientific writing. Pay special attention to clarity, coherence, and the logical flow of information. Consider reviewing exemplar lab reports and seeking constructive feedback from teachers or peers.
• Seek Feedback Early: Don't wait until your IA is fully developed to seek feedback. Discuss your ideas, research question, and methodology with your biology teacher or an IB tutor early in the process. Regular feedback can help refine your approach, identify potential pitfalls, and ensure your project is on the right track.
• Master Data Analysis Techniques: A significant part of the IA is analyzing the data you've collected. Brush up on your statistical skills and familiarize yourself with software or tools that can aid in data analysis. Understanding how to interpret your results accurately is crucial for drawing meaningful conclusions.
• Reflect on Your Learning: The IA is not just about demonstrating your knowledge of biology; it's also an opportunity to reflect on your learning process. Engage in self-reflection throughout your IA journey, noting what you've learned, challenges you've encountered, and how you've overcome them. This reflective practice not only enhances your IA but also contributes to your personal growth as a learner.
• The Effect of pH on Enzyme Activity: Investigate how different pH levels affect the activity of a specific enzyme, such as catalase found in potato cells. You'll need pH buffers, potato extract, hydrogen peroxide, and a spectrophotometer to measure the reaction rate. This experiment explores how enzyme function is influenced by pH, demonstrating the importance of homeostasis in biological systems.
• Photosynthesis Rate under Different Light Colors: Examine how light color affects the rate of photosynthesis using aquatic plants like Elodea. You'll need light sources of different colors, a carbon dioxide indicator solution, and a timer. By measuring oxygen production or CO2 consumption, students can understand how light wavelength influences photosynthetic efficiency.
• The Effect of Temperature on Bacterial Growth: Explore how temperature impacts the growth rate of bacteria such as E. coli. Required materials include bacterial cultures, nutrient agar plates, incubators set at different temperatures, and a colony counter. This experiment highlights the importance of temperature in microbial ecology and food safety.
• Plant Growth in Different Soil Types : Investigate how various soil types affect plant growth. You'll need seeds (such as beans), different types of soil (sand, clay, loam), pots, and a ruler to measure growth. This study can reveal the importance of soil composition on plant health and yield, essential for agriculture and ecology.
• The Impact of Salt Concentration on Seed Germination: Study how varying salt concentrations in water affect the germination rate of seeds like radishes. Materials include seeds, petri dishes, filter paper, and salt solutions of different concentrations. This experiment simulates the effects of soil salinity on plant life, relevant to understanding agricultural challenges and ecosystem responses to salinity.
• Caffeine's Effect on Daphnia Heart Rate : Examine the impact of different caffeine concentrations on the heart rate of Daphnia magna. You'll need a microscope, Daphnia, caffeine solutions, and a stopwatch. This experiment introduces students to the physiological effects of stimulants and the concept of dose-response relationships in pharmacology.
• The Role of Light Intensity on Plant Stomatal Density: Investigate how varying light intensities affect stomatal density in leaf specimens. Necessary materials include leaves from plants grown under different light conditions, a microscope, and clear nail polish for leaf impressions. This study explores how plants adapt to their light environments, affecting gas exchange and water loss.
• Antibiotic Resistance Spread in Bacteria: Explore how antibiotic resistance spreads among bacterial populations. Use antibiotic discs, bacterial cultures, nutrient agar, and an incubator. This experiment demonstrates the mechanism of natural selection and the importance of antibiotic stewardship in healthcare.
• The Effectiveness of Natural vs. Synthetic Antibacterials: Compare the antibacterial efficacy of natural substances (e.g., garlic, honey) versus synthetic antibacterials (e.g., commercial disinfectants). Materials include bacterial cultures, nutrient agar plates, paper discs soaked in antibacterial solutions, and an incubator. This topic highlights the potential of natural substances in fighting bacteria and the concept of antibiotic resistance.
• The Influence of Music on Plant Growth: Investigate the effect of different types of music on plant growth rates. You'll need plants, speakers, and various genres of music. By measuring growth over time, this experiment can explore the intriguing possibility of sound waves affecting plant physiology.
• Osmosis in Potato Tissue: Examine how osmotic balance is affected by salt or sugar solutions using potato strips. Materials include potato strips, various concentrations of salt or sugar solutions, and a balance. This simple yet effective experiment teaches the principles of osmosis and cell membrane permeability.
• The Impact of Different Fertilizers on Algae Growth: Study how various fertilizers influence algae proliferation in water samples. Required materials include water samples, different types of fertilizers, and a light source. This experiment highlights the issue of nutrient pollution and eutrophication in aquatic ecosystems.
• The Role of Mycorrhizal Fungi in Plant Growth: Investigate the impact of mycorrhizal fungi on the growth of plant roots. Materials include plant seedlings, mycorrhizal fungi inoculum, and soil. This study sheds light on the symbiotic relationships in ecosystems and their importance for plant nutrition.
• The Effect of Acid Rain on Plant Growth: E xamine how simulated acid rain (using solutions of different pH levels) affects the growth of plants. Materials include seedlings, pH-adjusted water solutions, and growth measurement tools. This experiment explores environmental stressors on plants and the broader implications of pollution.
• Genetic Diversity in Plant Leaf Morphology: Analyze the genetic diversity within a plant species by comparing leaf morphology. You'll need leaves from various individuals of the same species, a scanner or camera, and image analysis software. This project introduces concepts of genetic variation and its observable effects in populations.
• The Effects of Microplastics on Brine Shrimp Survival: Investigate the survival rate of brine shrimp in water with varying concentrations of microplastics. Use brine shrimp, microplastic particles, and tanks. This study highlights environmental issues and the impact of pollutants on aquatic life.
• Comparing Plant Transpiration Under Different Humidity Levels: Examine how different environmental humidity levels affect plant transpiration rates. Materials include plants, plastic bags to create humidity conditions, and a balance to measure water loss. This experiment explores plant water relations and adaptations to environmental stress.
• The Influence of Mobile Phone Radiation on Seed Germination: Study the effect of electromagnetic radiation from mobile phones on the germination rate of seeds. You'll need seeds, mobile phones, and controlled germination environments. This project investigates the potential impact of technology on biological processes.
• Assessing Vitamin C Degradation in Fruit Juices Over Time: Measure the degradation of vitamin C in various fruit juices stored at different temperatures over time. Use fruit juices, vitamin C test strips or a titration kit. This experiment explores nutrient stability and the factors affecting it.
• The Impact of Exercise on Human Heart Rate Recovery: Analyze how different intensities of exercise affect heart rate recovery in humans. Materials include a heart rate monitor, stopwatch, and volunteers. This study sheds light on cardiovascular fitness and physiological responses to exercise.
• Soil pH and Its Effect on Earthworm Activity: Investigate how varying soil pH levels affect the activity and distribution of earthworms. Materials include soil samples with different pH levels, earthworms, and observation containers. This experiment highlights soil health and biodiversity.
• The Role of Water Temperature in Goldfish Metabolism: Examine how changes in water temperature affect the metabolic rate of goldfish, using water baths, thermometers, and oxygen probes. This study explores ectothermic metabolism and environmental adaptations.
• Investigating the Allelopathic Effects of Plant Extracts on Seed Germination: Study how extracts from certain plants inhibit or promote the germination of seeds from other plants. Use plant extracts, seeds, petri dishes, and filter paper. This experiment delves into plant interactions and chemical ecology.
• The Effects of Different Light Intensities on Daphnia Heart Rate: Analyze how light intensity influences the heart rate of Daphnia magna, using a microscope, light sources with adjustable intensity, and a stopwatch. This explores the effects of environmental stimuli on physiological responses.
• The Efficacy of Various Water Purification Methods on Bacterial Content: Compare the effectiveness of different water purification techniques in reducing bacterial content. Materials include contaminated water samples, purification methods (filtration, boiling, chemical treatment), and agar plates for bacterial culturing. This study is relevant to public health and sanitation.
• The Impact of Aeration on Water Quality and Aquatic Life: Investigate how different levels of water aeration affect the quality of water and the health of aquatic organisms. Use tanks, aerators, water quality test kits, and aquatic plants or animals. This experiment highlights the importance of oxygen in aquatic ecosystems.
• Studying the Biodegradation Rate of Various Organic Materials: Compare the biodegradation rates of different organic materials under the same environmental conditions. Materials include organic substances (food scraps, paper, etc.), soil, and compost bins. This project emphasizes sustainability and waste management.
• The Effect of Light Wavelengths on Algae Photosynthesis: Examine how different wavelengths of light affect the photosynthesis rate of algae, using colored filters, light sources, and a CO2 indicator. This study contributes to understanding photosynthetic efficiency and light energy utilization.
• Insect Biodiversity in Different Habitats: Assess insect biodiversity across various habitats using pitfall traps, sweep nets, and identification guides. This project explores biodiversity, ecosystems, and the importance of conservation.
• The Influence of Sugar Types on Yeast Fermentation: Investigate how different types of sugar (glucose, fructose, sucrose) affect the fermentation rate of yeast, using yeast cultures, sugar solutions, and gas collection methods. This experiment explores cellular respiration and biochemistry.
• Assessing the Impact of Noise Pollution on Plant Growth: Study how different levels of noise pollution affect the growth of plants, using speakers to simulate noise conditions and measuring plant growth parameters. This investigates environmental stressors and plant responses.
• The Role of Antioxidants in Preventing Apple Browning: Examine the effectiveness of various antioxidants (lemon juice, vitamin C solution) in preventing the browning of apple slices, comparing treated and untreated samples. This explores oxidation reactions and food preservation methods.
• The Effect of Different Substrates on Worm Composting Efficiency: Compare the composting efficiency of worms in different substrates (paper, vegetable scraps, mixed organic material), measuring decomposition rate and soil quality. This highlights sustainable waste management and soil health.
• Exploring Plant Cloning Techniques in Potato Tubers: Investigate the efficiency of different plant cloning techniques using potato tubers, focusing on methods like cutting and grafting, and assessing growth success rates. This introduces genetic replication and agricultural practices.
• Studying the Effectiveness of Sunscreen in Blocking UV Radiation: Compare the effectiveness of different SPF sunscreens in blocking UV radiation using UV-sensitive beads or paper, highlighting the importance of sun protection and skin cancer prevention.
• The Impact of Sleep Deprivation on Cognitive Function in Students: Examine the effects of varying degrees of sleep deprivation on cognitive functions such as memory and reaction time in student volunteers, using cognitive tests and questionnaires. This explores human physiology and health science.
• Investigating the Rate of Water Absorption in Different Soil Types: Study how various soil types (clay, sand, loam) absorb water, using soil samples, water, and measuring equipment. This experiment is relevant to agriculture, gardening, and environmental science.
• The Effect of Magnetic Fields on Plant Growth: Explore the influence of different strengths of magnetic fields on the growth and development of plants, using magnets and plant specimens. This investigates electromagnetic effects on biological systems.
• Assessing the Antifungal Properties of Plant Extracts: Examine the antifungal efficacy of various plant extracts against fungal pathogens in plants, using fungal cultures, plant extracts, and agar plates. This study has implications for natural disease management in agriculture.
• The Influence of Carbon Dioxide Levels on Plant Growth: Investigate how varying concentrations of CO2 affect the growth rate of plants, using controlled environments with adjusted CO2 levels. This experiment is relevant to studies on climate change and plant physiology.
• Exploring the Effects of Different Pollutants on Microbial Soil Health: Assess the impact of various pollutants (oil, pesticides, heavy metals) on the microbial health of soil, using soil samples, pollutants, and microbial culture techniques. This highlights environmental pollution and ecosystem health.
• The Role of Salinity in Fish Osmoregulation: Study how different salinity levels in water affect the osmoregulation mechanisms of fish, using aquariums, salinity meters, and fish specimens. This experiment explores marine biology and physiological adaptations.
• Investigating the Effects of Urbanization on Bird Populations: Compare bird species diversity and population numbers in urban versus rural areas, using birdwatching techniques and data analysis. This project examines biodiversity loss and conservation in changing environments.
• The Impact of Different Cooking Methods on Vegetable Nutrient Content: Examine how boiling, steaming, and microwaving affect the nutrient content of vegetables, using cooking equipment, vegetables, and nutrient testing kits. This explores nutrition science and food preparation methods.
• Assessing the Effectiveness of Different Handwashing Techniques: Investigate the bacterial reduction efficacy of various handwashing techniques and products, using bacterial cultures, agar plates, and volunteers. This is crucial for public health and hygiene education.

For optimal preparation for the IA, students must have a solid grasp of the biology course content and hone their lab report writing skills. They should actively seek their teachers' input on their writing abilities and comprehension of the research methodology.

Deep Dive into the Syllabus:  Thoroughly understand the IB Biology syllabus. Knowing the curriculum inside out helps you identify areas that interest you and align with the IA requirements. It also ensures that your research question is relevant and grounded in the course content.

Practice Lab Report Writing:

• Enhance your lab report writing skills by practicing regularly.
• Familiarize yourself with the structure and conventions of scientific writing.
• Pay special attention to clarity, coherence, and the logical flow of information.
• Consider reviewing exemplar lab reports and seeking constructive feedback from teachers or peers.

Seek Feedback Early:  Don't wait until your IA is fully developed to seek feedback. Discuss your ideas, research question, and methodology with your biology teacher or an IB tutor early in the process. Regular feedback can help refine your approach, identify potential pitfalls, and ensure your project is on the right track.

Master Data Analysis Techniques:  A significant part of the IA is analyzing your collected data. Brush up on your statistical skills and familiarize yourself with software or tools to aid data analysis. Understanding how to interpret your results accurately is crucial for drawing meaningful conclusions. ‍

Reflect on Your Learning:  The IA is not just about demonstrating your knowledge of biology; it's also an opportunity to reflect on your learning process. Engage in self-reflection throughout your IA journey, noting what you've learned, your challenges, and how you've overcome them. This reflective practice not only enhances your IA but also contributes to your personal growth as a learner.

As we wrap up our exploration of these Biology IA topic ideas, I hope you've found inspiration and a starting point for your investigative journey. Each topic offers a unique opportunity to delve into the wonders of the biological world, challenging you to ask questions, seek answers, and contribute to our collective understanding of life's intricacies. Remember, the key to a successful IA lies in choosing a topic that interests you and approaching it with curiosity, diligence, and a scientific mindset. Happy researching, and may your IA journey be as enlightening as it is rewarding!

30 IB Biology IA Topic Ideas!

Are you struggling with choosing your topic for your IB Biology IA? Don’t worry, we’ve all been there. Finding a topic is one of the – if not THE – most important part of writing your IA, so we want to make sure that you get it right! Luckily, there are so many great topics to choose from, and we’ve asked some of our top team to note down some topics that might inspire your own incredible research!

NOTE: These topics are purely meant as inspiration and are not to be chosen blindly. Even though many of these topics led to high scores for some of our graduates in the past, it is important that you listen to the advice of your subject teacher before choosing any topic!

Get Support from a Top Tutor Today

At Lanterna we have hundreds of tutors who smashed Biology. They know exactly how to get a 7 in your IA and exam and can give you tips and tricks on how you can do the same. What are you waiting for? Get your own tutor today!

Biology ia ideas with independent variables

1, Look at the genetic similarities and differences between species, kingdoms, phylas, classes, genuses, orders, families, and domains.

2, Testing global warming: How does CO2, water vapour, oxygen, or any other variable affect  temperature inside a cutoff bottle exposed to simulated sunlight?

3, Describe how the primary productivity of algae changes with temperature, algae concentration, other aquatic plants, salinity, nutrients, and any other variables you may want to consider.

4, How does varying the gel concentrations of agarose affect DNA migration through a gel?

5, Effect of BMI on skin surface temperature in various body areas on rate of recovery once exposed to cold.

6, How does sudden change in body position affect heart rate and baroreceptor feedback?

7, How do the respiration rates of baker’s yeast and wine yeast in various sugar solutions compare?

8, How do the buffering actions of milk, yogurt, juices, detergents etc. compare?

9, Do our reaction times slow down with age?

10, Can we slow down the decaying times of vegetables? Can temperature, humidity, or exposure to sunlight affect how quickly vegetables decay?

Need inspo for Physics too? Check out some Physics IA ideas here !

11, What is the effect of the salt concentration on germination of different types of seeds?

12, What happens after the best-by date of dairy products?

13, Comparative study between 5 different species of animals using BLAST analysis to determine evolutionary history

14, What is the respective change of allele frequency when initial frequencies are manipulated?

15, Analysing the impact of river pollution on marine life.

16, Determine the effect of glucose concentration on the rate of osmosis.

17, What is the effect of pests on the diversity of plants in a lawn?

18, What is the effect of isotonic drinks on rehydration and recovery after exercise?

19, What is the difference in the CO2 levels exhaled before and after enduring physical exercise?

20, Testing the effectiveness of different types of toothpaste in inhibiting the growth of different types of bacteria.

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21, The effect of temperature / light on fruit ripening

22, Exploring stomatal density in a variety of conditions

23, Testing the effectiveness of toothpaste types

24, Investigating the effect of smoke water on the germination and growth of E.pilularis

25, Exploring the effect of sunlight on biomass

26, Exploring effect of light levels on the predation of the peppered moth

27, Investigating the effect of different light intensities on water weeds

28, How do different antibiotics interact with the process of seed germination?

29, Determining the effect of time on the plasmolysis of potatoes

30, Exploring mollusc shapes with regards to an external variable e.g. location on shore

So there we have it! 30 Biology IA topic ideas to get your lab report started! Still feeling a bit uneasy about the task ahead? Fear not, we have elite Biology tutors who can assist you through the process!

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30+ Biology IA Topics Ideas: New Topics for 2024

By TutorsPlus

Exams aren’t the only thing that matters in IB Biology. One-fifth of your final grade comes from the Internal Assessment (IA), and you’ll need those 24 marks it awards. This means that everything, from choosing a Biology IA topic to conveying your experiment and describing it in a report, needs to be carefully thought about.

Unfortunately, many students stumble on the very first step – finding the right topic. We can clearly see why – it must be within the IB Biology syllabus but still stand out, not too broad and not too narrow, piquing your interest but a manageable quantity of work.

At TutorsPlus, we would like to help. That’s why we asked our IB Biology tutors to put thier heads together and suggest 30+ exciting Biology IA topic ideas.

What is a Biology Internal Assessment?

Internal Assessment is a mandatory scientific assignment at the end of year two of your IB Diploma Programme. It is also your chance to explore a Biology topic that interests you.

To succeed , you need to design a scientific investigation, collect data, analyse your findings, and write a report about them. Thanks to IA, you can showcase your research and thinking skills, as well as prove that you actually understand Biology and not just memorise facts for exams.

IB Biology Internal Assessments consist of these major parts:

• Research Question . You are free to choose any question related to Biology as long as it is possible to conduct an experiment with available resources. It doesn’t have to be a topic covered in the syllabus but it should be on the same level of difficulty. Examiners tend to give more points for IB Biology topics you have a personal interest in, as they often see your enthusiasm shine through. So make sure you state clearly why you chose this topic and what effect it has on your life or society in general.
• Investigation . It is possible to gather information for your Biology IA in many ways. For example, you can design an experiment in a lab, conduct fieldwork, analyse data from a database, or even use a simulation. The most important is to collect and analyse quantitative data (numbers), supported by qualitative observations (descriptions) if relevant.
• Report . Once you’ve completed your investigation, you need to write a report summarising your findings. This report has a maximum word count of 3,000 words. This means you have to be clear, concise, and well-organised.

Biology IA grading system and criteria

Internal Assessment constitutes 20% of your final Biology grade whether you’re at SL or HL. Overall, it can bring 24 marks, which are evenly distributed across 4 marking criteria .

Research Design

This criterion focuses on how you set up your investigation. The examiners want to see a clear research question that has a specific context (i.e. scientific background). They also need to understand the methodology you used to answer that question.

In particular, you should clearly specify how you selected and measured your variables, what data you collected, and how you ensured the safety of your experiment. If there are any ethical or environmental considerations, you need to address them.

Data Analysis

The next criterion assesses how well you presented your findings. Your report must contain clear and accurate graphs, tables, and other relevant ways to organise your data. All of them should have appropriate labels, as well as feature annotations, units, decimal places, and significant figures.

Along with that, you shouldn’t forget to provide explanations of how you processed your data. Examiners also want to see that you considered any uncertainties or errors in your measurements.

To earn the 6 marks with this criterion, you need to clearly answer your research question. Your conclusion should explain what your data means based on your analysis and taking into account scientific knowledge that relates to your topic.

Besides, you need to show a comparison of your findings to this scientific context. Whenever you cite any sources in your report, they must be properly referenced.

It is important to be able to reflect on your investigation. In other words, your report must provide evidence of evaluation of your methodology.

In particular, you need to specify the strengths and weaknesses of your approach. Were there any limitations in how you collected or analysed your data? Could you have done anything differently? Here is also where you propose ways to improve your investigation if you could do it again.

30+ IB Biology IA Topic Ideas

An ideal IB Biology IA topic is one that sparks your curiosity and fuels your passion for science. When you’re genuinely interested in your topic, you’ll be more motivated to design a creative investigation and conduct a thorough experiment.

But you need to be careful when choosing your topics. You can find a lot of IA topic ideas on the Internet. However, you shouldn’t cut corners and simply copy them. That’s because examiners want to see investigations that show a unique perspective. This means your topic should be original.

Having said that, you can still count on us for IA biology ideas. The following list of 30+ possible topics is designed to inspire you, not replace your creativity. Use them to brainstorm your own unique and exciting IB Biology IA topic.

Ecology and Environment

• The impact of climate change on bird migration.

With this IA topic, you can investigate how climate changes affect bird migration patterns. Along with this, you can predict potential implications for ecosystems worldwide.

• Analysing the effects of water pollution on plant growth.

This topic can explore the effects of different pollutants on plant growth and health. Your conclusions are supposed to raise awareness about the importance of clean water.

• Assessing the health of forest ecosystems in relation to air pollution.

Here, you can examine the link between air pollution and forest health. The results of the investigation may highlight the need for cleaner air.

• Evaluating the effectiveness of methods for reclaiming polluted lands.

Such a topic requires you to explore various techniques for restoring contaminated areas. You also need to assess their potential to revitalise once-degraded landscapes.

• Investigating the anthropogenic influences on biodiversity in coastal ecosystems.

Specify the effects of human activities on the diversity of coastal habitats. It is also worth providing insights into the conservation efforts needed to preserve these fragile environments.

Genetics and Evolution

• Studying the effects of mutations on the development of certain diseases.

Explore how mutations alter DNA’s code and result in the development of certain diseases. Understanding these alterations can help create better treatments and preventative measures.

• Comparative analysis of genetic diversity within a species across different geographic regions.

Such a topic is a cross-regional exploration of genetic variation within a species. Your investigation can track the connection between geographic distribution and evolutionary processes.

• Assessing the role of natural selection in the evolution of a particular organism.

Your work may examine how natural selection shapes the adaptation and evolutionary trajectory of a specific organism. It can also offer insights into the mechanisms that promote biological diversity.

• Exploring the impact of genetically modified organisms on agriculture and ecology.

This topic encourages you to investigate how GMOs influence crop yields and pest resistance, as well as their potential ecological implications. Your findings can support the discussion about this powerful technology.

• Investigating the genetic mechanisms underlying specific behavioural traits.

By exploring this connection, you are able to gain insights into the interplay between genes and the environment as well as how they shape our behaviour.

• Evaluating the influence of different diets on metabolism.

Here, you have a chance to explore how various dietary patterns can influence metabolic processes. Your IA can track the relationship between nutrition and overall well-being.

• Examining the effects of physical activity on cognitive functions.

Investigate the impact of exercises on our cognitive abilities. You may also highlight the benefits of an active lifestyle on mental sharpness and overall brain health.

• Analysing the impact of stress on the immune system.

This Biology IA topic delves into the interplay between psychological stress and the body’s defence mechanisms. It is also necessary to specify how our emotional well-being can influence the ability to prevent illness and disease.

• Investigating the mechanisms of organismal adaptation to extreme environmental conditions.

This IB Biology Internal assessment should pinpoint the strategies employed by living organisms to survive in harsh environments.

• Assessing the influence of sleep on memory and cognitive processes.

With this IA, you can explore how sleep deprivation impacts learning, concentration, and overall brain function.

Biotechnology

• Evaluating the effectiveness of DNA encryption in biotechnology.

This investigation could examine how scientists safeguard sensitive genetic information as well as explore the ethical implications of DNA encryption.

• Studying the potential of gene therapy in treating genetic diseases.

With this IA, you can review the latest advancements in gene therapy. It is also necessary to explore the challenges and future prospects of gene therapy including corrective genetic materials.

• Analysing the impact of genetically modified crops on agriculture and the environment.

Examine the effects of genetically engineered crops on agricultural practices and the surrounding ecosystems. Your IA should contribute to the ongoing debate on food security and environmental sustainability.

• Investigating the ethical considerations of animal cloning.

This topic should focus on the potential benefits of this technology in medicine and conservation. At the same time, you need to address the ethical concerns surrounding animal welfare and unnatural reproduction.

• Assessing the potential use of stem cells in medical applications.

This IA is your chance to evaluate the potential of stem cells in revolutionising medical treatments. You may also explore such ways to improve healthcare as regenerative therapies, personalised medicine, and others.

Microbiology

• Studying the effects of antibiotics on the human microbiome.

This topic encourages you to explore how antibiotic use disrupts the microbiome balance in our bodies. You should also specify their potential consequences on human health.

• Analysing the impact of bacteriophages on bacterial populations in soil.

Here, you need to track the relationships between bacteriophages and bacterial populations in the soil. Along with this, it is important to explore the vital role of these viruses in regulating microbial communities and maintaining ecological balance.

• Evaluating the effectiveness of various sterilisation methods in medical facilities.

Such an IA should assess the efficiency of different sterilisation techniques to ensure safety and hygiene standards that protect patients and personnel from potential infections.

• Investigating the influence of prebiotics on the composition and function of the gut microbiome.

This investigation must focus on how prebiotics influence the composition and function of the gut microbiome. In particular, you need to discuss how it impacts digestion, immunity, and overall well-being. You should also offer ways to optimise gut health.

• Analysing the impact of microbial communities on plant health.

This IB Biology IA topic requires you to analyse the symbiotic relationship between plants and the microorganisms that coexist with them. Explain the vital role of these microbial communities on plant growth, nutrient uptake, and disease resistance.

Ethology and Animal Behaviour

• Studying the influence of social structures on the behaviour of social animals.

With this IA topic, you need to study the dynamics of social animal groups. In particular, it requires you to examine how various factors (such as size, hierarchy, and communication patterns) shape their behaviours and decision-making processes.

• Analysing the effects of the environment on behavioural patterns in birds.

Analyse how environmental factors such as light, temperature, and food availability influence behavioural patterns in different bird species. Discuss how these patterns contribute to adaptability and resilience.

• Assessing the impact of urban stressors on mammalian behaviour.

This Internal Assessment should explore the potential consequences of urbanisation on the behaviour and well-being of mammals. Reveal the challenges faced by these animals in adapting to rapidly changing environments.

• Investigating the genetic factors influencing animal behaviour.

Investigate the genetic factors influencing specific behaviours in animals, such as aggression, mating rituals, or parental care.

• Analysing the impact of food competition on fish behaviour in closed-water systems.

Here, you should explore the dynamics of resource competition among fish in controlled aquatic environments and specify the strategies they adopt to secure essential resources.

Biochemistry

• Evaluating the influence of different factors on the rate of enzymatic reactions.

Investigate how temperature, pH, and substrate concentration impact enzyme efficiency, explain cellular processes under various conditions, and suggest how these biological catalysts can be optimised for diverse applications.

• Studying the effects of diet on blood cholesterol levels.

With this Biology IA topic, you can study how different dietary components including saturated fat, fibre, and cholesterol intake affect cholesterol levels. You can also provide dietary recommendations for cardiovascular health.

• Analysing the impact of various antioxidants on the stability of cell membranes.

Assess the role of antioxidants in preserving the integrity of cell membranes. This investigation can lead to insights into strategies for preventing cellular damage.

• Assessing the influence of temperature on the rate of photosynthesis.

Determine how temperature fluctuations influence the efficiency of photosynthesis. Make conclusions on the conditions required for optimal plant growth and productivity.

• Investigating the mechanisms of organismal adaptation to changes in pH in the environment.

This IA could take a closer look at the strategies the living organisms use to cope with fluctuations in environmental acidity. Make conclusions on the physiological and genetic mechanisms that facilitate adaptation and survival.

Biomedicine

• Investigating the influence of genetic factors on cancer development.

This independent investigation can study the influence of specific genes and mutations on cancer risk. Explain the mechanisms that contribute to the growth and progression of this disease.

• Analysing the mechanisms of infectious disease development.

With such a Biology IA, your task is to explain how pathogens including bacteria or viruses invade the body, replicate, and cause illness. You also need to provide strategies for prevention and treatment.

• Exploring the effects of viruses on host genetic material.

This involves investigating the interactions between viruses and the genetic material of their hosts. You need to highlight the impact these pathogens can have on cellular function and disease progression.

• Analysing the mechanisms underlying allergic reactions.

Study the immunological processes that trigger allergic responses. Explain how the body’s defense mechanisms work as well as describe potential strategies for allergy prevention and treatment.

How Can I Prepare for the IA?

You have chosen Biology as part of your IB Diploma Programme for a reason. Perhaps, you wanted to know more about the world around you or your own body. But are there specific areas of Biology that you’re most interested in?

Maybe you’re fascinated by cell structures, mechanisms of adaptation to the surroundings, or you want to know how diseases appear? Use your curiosity as a starting point for your Internal Assessment.

Once you have a general area, it’s time to turn it into a specific research question. The most important is to make your question narrow enough so that you can investigate it within a limited time.

For example, instead of asking something broad like “How does food affect health?”, you can narrow it down to “How does eating saturated fats compared to unsaturated fats affect blood cholesterol levels?”

However, being unique and specific are not the only requirements for your research question. It also needs to be doable. This means you need to consider the resources you have on hand.

Can you do your experiment with the equipment available at school or at home? Are there any ethical considerations for your topic? If you have any doubts, you should discuss them with your teacher to prevent any unexpected challenges down the line.

Besides choosing an appropriate research topic, your IA will consist of the following steps:

• Selecting dependent, independent, and control variables;
• preparing the necessary equipment and materials;
• creating a clear and detailed methodology;
• conveying your experiment and meticulously writing down your results;
• analysing and evaluating your findings;
• creating a report of up to 3000 words.

We have a guide on how to write your IB Biology Internal Assessment – make sure to use it to aim to secure all 24 points.

Conclusions

Your IB Biology Internal Assessment is both exciting and challenging. It provides an excellent opportunity to experience what it’s like to be a real scientist. But it also means that you need to be just as meticulous as one, from choosing your topic to recording your findings. And here is where many students get stuck.

If you, too, find yourself in hot water, don’t be afraid to ask for help. TutorsPlus is a team of experienced Biology tutors, certified teachers and IB examiners who are happy to assist you in your Internal Assessment journey.

We understand the importance of the IA in your overall IB Biology score and want to help you achieve your best. With our support, you will be able to write a high-quality Internal Assessment that showcases your scientific understanding and research skills.

You can contact us at 022 731 8148 or [email protected]. We are excited to help you get 24 marks for your IA.

Sara has been an education consultant for TutorsPlus for 15 years, and is an expert on international IB education.  She is also a parent of two lively children.

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Ib biology sl ia ideas.

The IB Biology SL Internal Assessment (IA) is a project that requires students to complete an independent research project on a chosen theme. The IA is worth 20% of the final assessment and is an opportunity for students to showcase their understanding of the subject. Here are some carefully curated IB Biology SL IA topic ideas to help students get started. These ideas have been tried and tested and are popular with examiners. The list includes the basic reasons for investigating each topic, possible independent and dependent variables, and the experimental setup. It’s important to consider if the topics can be applied to one’s own life, as this shows personal engagement.

1.) How do different sodium chloride concentrations affect seed germination in the bougainvillaea plant?

Experimental setup:.

Soak the bougainvillaea seeds in sodium chloride of varying concentrations for a specific time period. Place them in Petri dishes and count the number of seeds that germinate. Conduct at least 5 trials, excluding control. 

Independent Variable:

Sodium chloride concentrations

Dependent Variable:

Seed germination percentage

2.) How does extract of the seeds and the leaves of the moringa plant (herbal medicine) show antifungal activity against the Malassezia yeast (Pittosporum) fungi?

Experimental setup: , mix yeast and herbal medicine. then use agar plates and fungus to test their effectiveness by seeing how many fungi grow in the different plates. , independent variable: .

Seeds and the leaves of the moringa plant

Dependent Variable: 

Antifungal activity

3.) How does the concentration of zinc chloride affect the growth of plaque?

Mix different concentrations of zinc chloride in different agar plates and bacteria, and check for plaque formation over time. 

Concentration of zinc chloride

Growth of plaque

4.) How effective are synthetic antibacterial products compared to natural antibacterial products against the growth of Cut bacterium acne?

Chose a synthetic and natural antibacterial product and mix them with a little water to create diluted solutions of them. Then use agar plates and bacteria to test their effectiveness by seeing how many bacteria grow in the different plates.

Types of antibacterial products (Natural vs synthetic)

Growth of Cut bacterium acne

5.) How do the different teas, used to water Vignata radiata seeds, affect the germination rate?

Place Viganata radiata seeds into various Petri dishes of the same number. Water them regularly using a diluted solution of different types of teas. Count the number of seeds that germinate over time and take note. Repeat the same procedure 5 times, including control. 

The different types of teas (green tea, chamomile, etc)

The rate of germination of Vignata radiata

6.) How do varying salinity levels affect the rate of germination in the grass species Spartina anglica and Eragrostis plana?

Use different concentrations of salinity levels in petri dishes with the two different grass species and compare the rate of gemination over a period of time. Repeat for five trials.

Salinity levels

Germination rate

7.) What is the effect of potassium ion concentration (ppm) on the initial (day 0 to day 2) rate of growth of Hygrophilla difformis through mass change per day (g/day) over a period of 1 week?

Use various concentrations of potassium in the soil in which the hygrophilla difformis has been planted to asses rate of growth over 1 week. compare the different pots containing varied concentrations to conclude on the optimum level..

Potassium concentration

Rate of growth

8.) Effect of different concentrations of fertilisers on growth of Solanum lycopersicum?

In various pots (atleast 5) containing Solanum lycopersicum, add varied levels of fertiliser concentration and assess rate of growth over a period of time.

Fertilizer concentration

9.) Effects of the addition of different concentrations of 11% humic acid and 5% fulvic acid on rate of growth and fruit development in Solanum lycopersicum L?

Take the required number of pots, and add humic and fluvic acid to Solanum Lycopersicum in soil of varying concentrations and asses the rate of growth over and fruit development over a fixed period of time. Compare the different pots containing varied concentrations to conclude on the optimum combination.

Mixture of humic and fulvic acid

Rate of change of the height of the plant

10.) To what extent does light intensity affect the concentration of sucrose within a kiwi?

Exposing samples of kiwi concentrate to different light intensities for certain periods of time and measuring their sucrose concentrations before and after.

• Light Intensity

Sucrose Concentration

11.) Effect of Potassium concentration on the growth rate of Raphanus sativus (Radishes)?

Planting and growing radishes within the same type of soil of different potassium ion concentrations.

Potassium Ion Concentration

Length of shoot and root of Raphanus sativus

12.) Effect of temperature on the concentration of Vitamin C within various citrus fruits?

Extracting different citrus fruit concentrates such as grapefruits, oranges and lemons and heating these samples at different temperatures for a certain duration and measuring their Vitamin C concentration before and after.

Temperature

• Citrus Fruits

Vitamin C Concentration

13.) Investigating the effect of different light intensities and frequencies on the rate of photosynthesis in Spinacia Oleracea.

Exposing samples of Spinacia oleracea(spinach) leaves to different light intensities for certain periods of time and measuring the rate of photosynthesis.

• Frequency of Light

Rate of Photosynthesis of Spinacia Oleracea

14.) Examining the relationship between temperature and the rate of cellular respiration in yeast.

Under different environmental temperatures within a certain time period, we measure the amount of carbon dioxide and water released by samples of yeast as a measure of their rate of cellular respiration..

Rate of Respiration (By measuring the amount of carbon dioxide and water released)

15.) To what extent does the frequency and wavelength of sound affect the growth of Triticum Aestivum

Observing the germination rate and rate of growth of Triticum Aestivum under sound treatment with different frequencies and wavelengths of sound.

• Frequency of sound
• Wavelength of sound
• Germination rate of Triticum Aestivum
• Growth rate of Triticum Aestivum

16.) Investigating the effect of salt concentration on the germination rate of Raphanus Sativus.

Analysing and measuring the germination rate of Raphanus Sativus seeds(radish seeds) with provision of various concentrations of salt dissolved in water.

Concentrations of salt in water

Rate of germination of Raphanus Sativus

17.) To what extent does light wavelength and light intensity affect the rate of curdling of cow milk.

Placing various samples of milk underneath different light intensities(low, medium, high) and wavelengths(normal, no light, red, blue, etc.) for a duration of 2 hours and observing the rate of curdling by measuring the change concentration of lactic acid. The milk is curdled by first heating the milk until it comes to a boil and then placing a fixed amount of curd into the samples.

• Light wavelength

Change in concentration of Lactic acid in cow milk

18.) Examining the relationship between the concentration of carbon dioxide and the rate of photosynthesis in Elodea.

Measuring the effect of various concentrations of carbon dioxide on the photosynthesis of samples of Elodea for a certain duration of time.

• Carbon dioxide concentration

Rate of photosynthesis(Amount of oxygen and glucose produced)

19.) Investigating the effect of different pollutants on the oxygen content of various aquatic environment water

Placing various types of pollutants within samples of aquatic environmental water and measuring the change in quantity of dissolved oxygen within the sample..

Various types of pollutants and different aquatic environmental water samples

Change in quantity of dissolved oxygen

20.) How does the concentration of sucrose affect the rate of osmosis in potato cells?

Cut identical pieces of potato and place them in solutions of different concentrations of sucrose. Measure the change in mass of the potato pieces over time.

Concentration of sucrose solution

Change in mass of potato pieces

21.) What is the effect of caffeine on the heart rate of daphnia?

Observe the heart rate of daphnia under the influence of caffeine at different concentrations..

Concentration of caffeine

Heart rate of daphnia

22.) What is the effect of different types of music on the growth rate of pea plants?

Play different genres of music to pea plants and measure the rate of growth.

Genre of music

Rate of growth of pea plants

23.) How does the concentration of salt affect the activity of the amylase enzyme in saliva?

Add amylase enzyme to saliva at different concentrations of salt and measure the rate of starch breakdown.

Concentration of salt in saliva

Rate of starch breakdown

24.) How does the temperature affect the rate of respiration in yeast cells?

Measure the rate of carbon dioxide production by yeast cells at different temperatures.

Rate of carbon dioxide production

25.) Investigating the effect of temperature and carbon dioxide on the rate of enzyme activity and fermentation in Saccharomyces cerevisiae

Exposing samples of Saccharomyces cerevisiae (yeast) to different temperatures and carbon dioxide concentrations and measuring the rate of enzyme activity and fermentation.

• Carbon Dioxide
• Rate of Enzyme Activity of Saccharomyces cerevisiae
• Rate of Fermentation

26.) Investigating the effect of different concentrations of salt on the germination and growth rate of Phaseolus vulgaris

Germinating samples of Phaseolus vulgaris (common bean) in solutions of different concentrations of salt and magnesium and measuring the germination and growth rate.

• Concentration of Salt
• Concentration of Magnesium
• Germination Rate of Phaseolus vulgaris
• Growth Rate of Phaseolus vulgaris

27.) Investigating the effect of pH and light intensity on the activity of catalase and its rate of denaturation extracted from Prunus avium

Extracting and exposing samples of Prunus avium(cherries) to solutions of different pH values and light intensities and measuring the activity of catalase and its rate of denaturation.

• pH of solution

Light intensity

• Activity of Catalase from Prunus avium
• Rate of denaturation

28.) Investigating the effect of temperature and carbon dioxide concentration on the rate of photosynthesis in Elodea canadensis

Exposing samples of Elodea canadensis (Canadian waterweed) to different temperatures and measuring the rate of photosynthesis using a dissolved oxygen probe.

• Temperature of the water in which Elodea canadensis is placed.

Rate of photosynthesis in Elodea canadensis measured by the amount of oxygen produced.

29.) Investigating the effect of different environmental conditions on the ripening of Citrus × sinensis, Citrus × aurantiifolia and Citrus × paradisi

Create a study that monitors the levels of ethylene or CO2 in fruits over a period of time, while subjecting different fruits to varying independent variables.

• Concentration of Ethylene
• Concentration of CO 2

30.) Investigating the effect of nitrate and magnesium concentration in soil on the germination and folate content of Solanum lycopersicum.

Growing samples of Solanum lycopersicum (tomato) in different types of soil and measuring the growth and folate content of samples.

• Nitrate concentration of soil

Magnesium concentration of soil

• Growth of Solanum lycopersicum.
• Folate content of Solanum lycopersicum

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IB Biology HL IA Ideas

The IB Biology HL Internal Assessment (IA) is a 20% project that requires students to complete an independent research project on a chosen theme. Here are some carefully curated IB Biology HL IA topic ideas to help students get started. These ideas have been tried and tested and are popular with examiners. The list includes the basic reasons for investigating each topic, possible independent and dependent variables, and the experimental setup. It’s important to consider if the topics can be applied to one’s own life, as this shows personal engagement.

1.) How do temperature and light intensity that affects photosynthesis balance out each other when it comes to the time taken for photosynthesis to occur?

Expose selected plants with different levels of temperature and light intensity to find the optimum combination for maximum growth rate. Conduct at least 5 trials, excluding control. 

Temperature and light intensity

Time taken for photosynthesis

2.) To what extent does scarification have an effect on germination percentage and shoot growth?

Select a seed that requires scarification and treat it with different methods of scarification like heat, acid and freeze-thaw. Conduct at least 5 trials, excluding control. Compare results to conclude which scarification is most effective. 

Types of scarification

Germination percentage and shoot growth

3.) How do cumin and turmeric powder, in comparison to indigestion tablets, affect the rate of neutralization of hydrochloric acid, measured by the difference of change in pH levels in 5 minutes?

Measure every 5 minutes, the amount of time it takes for the pH of hydrochloric acid to reach a neutral state (pH of 7) when adding cumin and turmeric powder to one sample and indigestion tablets to another sample. Conduct at least 5 trials, excluding control. 

Cumin and turmeric powder

Rate of neutralization of hydrochloric acid

4.) How do different concentrations of Gibberellic acid affect the germination of a Dolly Parton rose?

Soak the Dolly Parton rose seeds in Gibberellic acid of varying concentrations for a specific time period. Place them in Petri dishes and count the number of seeds that germinate. Conduct at least 5 trials, excluding control. 

Different concentrations of Gibberellic acid

Germination of a Dolly Parton rose

5.) What is the effect of different concentrations of green tea extract on the rate of fermentation of yeast?

Add yeast to various Petri dishes containing water with different concentrations of green tea extract. Over time, calculate the pH to determine the level of carbon dioxide produced by the yeast. 

Different concentrations of green tea extract

Change in carbon dioxide concentration produced by yeast

6.) What is the effect of changing the light intensity on the speed of wood louse Armadillidium Vulgare?

Use atleast 5 different light intensities in an enclosed glass container with the wood louse Armadillidium Vulgare and capture the movement of the creature to asses speed.

7.) Comparing the vitamin C or ascorbic acid concentration in store-bought fruit juices and fresh fruits using a titrimetric method?

Fruit samples must be blended with metaphosphoric acid. The homogenous mixture must be measured around and diluted into a volumetric flask with metaphosphoric acid (HPO3). The diluted sample must then be filtered to remove away suspension using a vacuum pump before 10 ml aliquote of the filtrate is pipetted into a small Erlenmeyer flask. The filtrate must be immediately titrated with a dye solution to a faint pink endpoint.

Type of packed and fresh juices

Amount of iodine, types of fruits

8.) An Investigation on the Effect of Varying Concentrations of Amino Acid Glycine on the Seed Germination of Phaseolus vulgaris Seeds?

Take the required number of petri dishes, and add varying concentrations of amino acid glycine to Phaseolus vulgaris Seeds. Asses the rate of germination over a fixed period of time and compare results to optimum concentration.

Varying concentrations of Glycine

Seed germination

9.) Effect of different caffeine concentrations on the blinking rate of the human eye?

Providing different people categorized on age, weight and height, different concentrations of caffeine and recording their blinking rate for a duration of 5 minutes with a reliable camera

Caffeine Concentration

Blinking rate of the human eye

10.) Determination of the ideal pH and temperature for accelerated germination of tomatoes?

Placing different groups of tomato seeds in various combinations of pH and temperature conditions and determining the ideal pH and temperature conditions based upon number of seeds germinated and time consumed to do so.

Germination of Tomato seeds

11.) Investigation of the effects of magnesium on the rate of photosynthesis in Brassica Rapa.

Measuring the rate of photosynthesis of various samples of Brassica Rapa which have been planted utilising the same type of soil or fertiliser but with various concentrations of magnesium.

Rate of photosynthesis of Brassicar Rapa

12.) Investigation of pH and salt concentration on the heart rate of daphnia, a type of water flea.

Under different environmental conditions of pH and salt concentration, measure the heart rate of daphnia under a microscope and count the number of heart beats within a certain time period.

pH and Salt concentration of water

Heart rate of water flea

13.) Analysis of the relationships between various abiotic factors such as and the diversity of plant species in a specific ecosystem.

Research upon different types of ecosystems that seem to be similar but have different abiotic factors and observe the different species within the ecosystem and understand the possible reasons as to the amount of biodiversity in the ecosystem.

Abiotic factors

Biodiversity of ecosystem

14.) Examination of the effect of different types of oil on the cellular structure of plant cells of Solanum Tuberosum

Soaking samples of Solanum Tuberosum within various types of oils for a certain duration of time and analysing the cellular structure of plant cells, primarily the shape of their cell wall.

Type of Oil

Cell wall structure and other cellular components of Solanum Tuberosum

15.) To what extent does different types of cooking techniques have on the concentration of vitamin A in Daucus Carota

Measure the vitamin A concentration of Daucus Carota samples before they undergo cooking in various ways such as boiling, pan-frying, grilling and more and then measuring the vitamin A concentration after the cooking process and comparing the vitamin A concentration.

Method of Cooking

Vitamin A concentration

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16.) investigating the ideal ratio of potassium:magnesium in fertilisers on the growth of seedlings of zingiber officinale..

Placing seedlings of Zingiber officinale that are approximately the same age and measuring the rate of growth with shoot and root length over a fixed period of time within samples of soil with different potassium:magnesium ratios

Ratio of potassium:magnesium in fertiliser

• Shoot length of Zingiber Officinale
• Root length of Zingiber Officinale

17.) To what extent does temperature and light intensity affect the concentration of phenolic acid within samples of Rubus Idaeus

Heat samples of Rubus Idaeus concentrate and measure the concentration of phenolic acids before and after the process.

Concentration of phenolic acid of Rubus Idaeus sample

18.) Examination of the effects of different physical and chemical treatments on the germination and growth of Carica papaya seeds.

Provide various types of treatments to samples of Carica papaya seeds and measure the germination and growth rate of these seeds.

Types of treatment(physic

• Germination of Carica papaya
• Growth rate of Carica papaya

19.) What is the effect of light intensity on the rate of photosynthesis in spinach leaves?

Place spinach leaves in different light intensities and measure the rate of oxygen production.

Rate of oxygen production

20.) How does the presence of salt affect the germination of bean seeds?

Plant bean seeds in soil with varying concentrations of salt and measure the rate of germination.

Concentration of salt in soil

Rate of germination

21.) What is the effect of pH on the activity of lactase enzyme in milk?

Add lactase enzyme to milk at different pH levels and measure the rate of lactose breakdown.

pH level of milk

Rate of lactose breakdown

22.) How does the presence of different types of antibiotics affect the growth of E.coli bacteria?

Culture E.coli bacteria in the presence of different types of antibiotics and measure the rate of growth.

Type of antibiotic

Rate of growth of E.coli bacteria

23.) What is the effect of light wavelength on the rate of photosynthesis in elodea plants?

Illuminate elodea plants with different wavelengths of light and measure the rate of oxygen production.

Wavelength of light

24.) How does the salinity of water affect the survival of brine shrimp?

Place brine shrimp in water of different salinity levels and measure the survival rate.

Salinity of water

Survival rate of brine shrimp

25.) Investigation of the effect of different light wavelengths and intensities on the growth and starch content of Arabidopsis thaliana.

Growing samples of Arabidopsis thaliana (thale cress) under different wavelengths of light and evaluating their growth rates and starch content.

• Light Wavelength
• Growth rate of Arabidopsis thaliana
• Starch Content of Arabidopsis thaliana

26.) Investigation of the effect of different hormones and light wavelength on the development of embryos of Xenopus laevis.

Treating fertilized eggs of Xenopus laevis (African clawed frog) with different hormones and light wavelengths and measuring the development of the embryos.

• Type of Hormone
• Development of Xenopus laevis embryos

27.) Investigation of the effect of exercise on the concentration of lactate and potassium in the blood of humans

Having human participants engage in different levels and intensities of exercise and measuring the concentration of lactate and potassium in their blood.

• Level and Intensity of Exercise
• Concentration of Lactate in the Blood of Humans

28.) Investigation of the effect of different antibiotics in different pH concentrations on the growth of Bifidobacterium

Growing samples of Bifidobacterium in the presence of different antibiotics and pH environments and measuring their growth.

• Type of Antibiotic
• Growth of Bifidobacterium

29.) Investigation of the effect of different concentrations of carbon dioxide on the rate of photosynthesis and respiration in Chlorella vulgaris

Exposing samples of Chlorella vulgaris (green algae) to different concentrations of carbon dioxide and measuring the rate of photosynthesis and respiration.

• Concentration of Carbon Dioxide
• Rate of Photosynthesis of Chlorella vulgaris
• Rate of Respiration of Chlorella vulgaris

30.) Investigation of the effect of different environmental conditions on the behavior and lifespan of Drosophila melanogaster

Observing the behavior and lifespan of Drosophila melanogaster under different environmental conditions, such as temperature, humidity, and light exposure.

• Light Exposure and more
• Behavior of Drosophila melanogaster
• Lifespan of Drosophila melanogaster

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22 Biology IA Topic Ideas

Written By IB++ Tutor Zohaib N.

Internal Assessment

The internal assessment requirements are the same for biology, chemistry and physics. The internal assessment, worth 20% of the final assessment, consists of one scientific investigation. The individual investigation should cover a topic that is commensurate with the level of the course of study. Student work is internally assessed by the teacher and externally moderated by the IB. The performance in internal assessment at both SL and HL is marked against common assessment criteria, with a total mark out of 24.

The task will have the same assessment criteria for SL and HL. The five assessment criteria are personal engagement, exploration, analysis, evaluation and communication.

Internal assessment criteria the new assessment model uses five criteria to assess the final report of the individual investigation with the following raw marks and weightings assigned:

• Personal engagement 2 (8%)
• Exploration 6 (25%)
• Analysis 6 (25%)
• Evaluation 6 (25%)
• Communication 4 (17%)
• Total 24 (100%)

Here is a list of top 22 Biology Internal Assessment (IA) ideas:

• How do the factors temperature and light intensity that affect photosynthesis balance out each other when it comes to the time taken for photosynthesis to occur?
• How does increasing the concentration of Oxytetracycline in mg/L affect root elongation in cm of Citrus limon?
• How does cumin and turmeric powder, in comparison to indigestion tablets, affect the rate of neutralization of hydrochloric acid, measured by the difference of change of pH levels in 5 minutes?
• How does different concentrations of Gibberellic acid affect the germination of a dolly Parton rose?
• To what extent does the mass of sodium nitrate powder have an effect on the quality of beef as a preservative
• How does different sodium chloride concentrations affect seed germination in the bougainvillea plant?
• How does different conditioners affect the strength of hair?
• How does extract of the seeds and the leaves of the moringa plant (herbal medicine) show antifungal activity against the Malassezia yeast (Pittosporum) fungi that causes dandruff?
• How does the concentration of zinc chloride affect the growth of plaque?
• How effective are synthetic antibacterial products compared to natural antibacterial products against the growth of Cut bacterium acnes?
• What brand of laundry detergent is the most effective in the digestion and removal of lipid stains?
• How does the pH level of watering solution affect the growth and development of chickpea (Cicer arietinum) and mung bean (Vigna radiata) over a time period of 5 days indicated by the length of the stem measured?
• How would changing (storage) temperatures affect the rate of change of pH of different types of milk due to spoilage?
• How does the acidity of different beverages affect the deterioration of tooth enamel? (Use egg as imitation of tooth)
• How does a sudden and intensive workout affect the heart rate, and to what extent does warm up have an impact on the maximum heart rate?
• How do different concentrations of lactases affect the breakdown of disaccharides like lactose in milk effectively?
• How does the composition of soil affect the growth of runner Plants from the original plant?
• How does stomatal density change according light exposure of red and blue light?
• How does the percentage of salinity in water affect the rate of growth of radishes in mass?
• How do natural antiseptics (ginger and turmeric) compare with commercial antiseptics in the inhibition of growth of e. coli bacteria?
• What effect does temperature have on the ripening process of a fruit?”
• Investigate the influence of Ph levels in the soil on the development of the Lepidium avitum 2) How does the concentration of potassium chloride affect the growth of Lepidium savitum.
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Empowering Minds, Exploring Life

Biology IA Examples: Exploring Interesting Projects

Biology Internal Assessments (IAs) are not just a part of the IB curriculum; they’re a golden ticket for students to dive headfirst into the fascinating world of scientific exploration. In this comprehensive guide, we’ll walk you through a variety of interesting Biology IA examples that go beyond the classroom, providing students with hands-on experiences that are both educational and fun.

Investigating Enzyme Activity:

Enzymes, those microscopic heroes in our cells, make biochemical reactions happen. For an engaging IA, students can explore how external factors influence enzyme activity. This might involve experimenting with varying temperatures to observe the effects on catalase activity in liver cells. By understanding these nuances, students not only unravel the complexities of enzymes but also gain insights into real-world applications.

Examining Plant Growth Responses:

Plants, often underestimated, are incredible organisms with complex growth responses. In a captivating IA project, students can experiment with different concentrations of plant growth hormones to decipher their impact on bean plant growth. This isn’t just about playing with plants; it’s a chance to uncover the regulatory mechanisms that govern plant development and growth.

Studying Microbial Growth:

Microbes, though tiny, wield substantial power in the biological landscape. IA projects focused on microbial growth open up a realm of possibilities. For example, investigating how antibacterial agents affect the growth of Escherichia coli or studying the influence of environmental factors on mold growth on bread provides valuable insights. These explorations not only contribute to our understanding of microbes but also have practical implications in fields like medicine and food safety.

Investigating Genetic Inheritance:

Genetics , the code of life, is a playground for exciting IA projects. Students can delve into genetic traits using model organisms like fruit flies, unraveling the principles of inheritance. Alternatively, exploring the distribution of blood types in a specific population unveils the intricacies of genetic inheritance. These projects not only enhance genetic literacy but also allow students to actively contribute to ongoing genetic research.

Analyzing the Impact of Environmental Factors

Ecology comes to life in IA projects examining the relationship between organisms and their environment. By experimenting with environmental factors such as pollution or habitat changes, students can uncover their impact on population dynamics. A compelling IA might involve studying the effects of different pollutants on the growth of aquatic microorganisms, providing valuable insights into the delicate balance of ecosystems.

Investigating Human Physiology:

Our own bodies are a treasure trove of mysteries. IA projects in human physiology can focus on systems like the heart, lungs, or senses. For instance, studying the effects of exercise on heart rate or exploring the connection between taste perception and genetic variations offers a window into the intricate workings of the human body. These projects not only deepen our understanding of human biology but also have implications for health and well-being.

Conclusion:

Biology IAs offer more than just grades; they offer a chance for students to actively engage with science. The examples explored in this guide highlight the vast possibilities within the realm of Biology IAs, showcasing how students can not only grasp theoretical concepts but also contribute to the broader scientific community. As students embark on these investigative journeys, they’re not just students – they’re budding scientists uncovering the mysteries of the biological world.

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IB Biology IA: 60 Examples and Guidance

Charles Whitehouse

The International Baccalaureate (IB) program offers a variety of assessments for students, including Internal Assessments (IAs), which are pieces of coursework marked by students’ teachers. The Biology IA is an assessment designed to test students' understanding of the material they have learned in their biology course, their ability to conduct independent research, and their competence in applying their knowledge to real-world biological issues.

What is the IA?

The IA consists of a laboratory report that students must complete during their IB biology course. For assessments before May 2025, the report should be 6 to 12 pages in length, but after May 2025, the length requirement is updated to a maximum of 3,000 words.

What should the IA contain?

The research question for the internal assessment should be a testable question that is related to the biology curriculum. It's essential that the question is relevant to the biology curriculum, specific and clearly defined. The methodology section should explain how the research was conducted, including the materials and methods used. The methodology should be detailed and well-explained, and should include information on the materials and methods used, as well as any ethical considerations.

Data analysis is an important aspect of the IA. Professional IB Biology tutors recommend that students should present their data in a clear and organized manner, and should use appropriate statistical analysis to interpret their results. They should also make sure to include a discussion of the limitations of their study and the implications of their findings.

The conclusion should summarise the main findings of the study, relate the results back to the research question, and address the relevance of these findings to the broader context of the biological field.

In addition to the laboratory report, students must complete a reflective statement, which is mandatory. This statement should be around 500 words long and must include references to how the student has achieved specific learning objectives outlined in the IB Biology syllabus, and should reflect on the student’s learning during the internal assessment process. The reflective statement should include a description of the student’s personal learning process, including successes and challenges, as well as an evaluation of their performance on the internal assessment and the skills they have gained through the process.

Have a look at our comprehensive set resources for IB Biology developed by expert IB teachers and examiners!

- IB Biology 2024 Study Notes

- IB Biology 2025 Study Notes

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What are some example research questions?

Here are examples with details of potential research questions, written by expert IB Biology tutors and teachers, that could inspire your Biology IA:

1 - Investigating the effect of different types of sugars on the rate of fermentation by yeast. To investigate the effect of different concentrations of a specific herbicide on the growth rate of a particular plant species, one could set up an experiment in which the plants are grown in soil with varying concentrations of the herbicide. An appropriate range of concentrations and a suitable plant species would need to be chosen, along with control variables such as light, temperature, and watering. The growth rate of the plants could be measured by tracking their height or mass over a set period of time. Comparing the growth rates of the different groups would determine the impact of the herbicide on the plant's growth.

2 - How does the pH of a solution affect the activity of an enzyme? To investigate the effect of pH on enzyme activity, one could set up an experiment in which the enzyme is exposed to solutions with varying pH levels. The enzyme's activity could be measured by monitoring the rate of a specific reaction catalyzed by the enzyme. Control variables such as temperature, substrate concentration, and enzyme concentration would need to be kept constant. By comparing the activity of the enzyme at different pH levels, the optimal pH range for the enzyme could be determined.

3 - Can the concentration of vitamin C in different types of fruit juice be determined using titration?

To determine the concentration of vitamin C in different types of fruit juice using titration, a standardized solution of a known concentration of potassium permanganate would be prepared. A sample of the fruit juice would be titrated with the potassium permanganate solution until the endpoint is reached, indicating that all the vitamin C has reacted with the potassium permanganate. The concentration of vitamin C in the fruit juice can then be calculated based on the volume and concentration of the potassium permanganate solution used in the titration. This process would need to be repeated for each type of fruit juice being tested.

4 - Investigating the effect of light intensity on the rate of photosynthesis in aquatic plants.

Set up an experiment in which aquatic plants are placed in containers with varying levels of light intensity. The light intensity could be controlled by adjusting the distance between the light source and the plants. The rate of photosynthesis could be measured by tracking the amount of oxygen produced by the plants over a set period of time. Comparing the rates of photosynthesis of the different groups would determine the impact of light intensity on the plant's photosynthetic activity. Control variables such as temperature, water quality, and plant species would need to be kept constant.

5 - How does the concentration of carbon dioxide affect the rate of photosynthesis in terrestrial plants?

Conduct an experiment in which plants are grown under different concentrations of carbon dioxide. The plants would need to be grown in a controlled environment with consistent light, temperature, and watering. The rate of photosynthesis could be measured by monitoring the oxygen production of the plants using a dissolved oxygen probe. The results could then be analyzed to determine how the concentration of carbon dioxide affects the rate of photosynthesis in terrestrial plants.

6 - Can the presence of glucose in urine be determined using Benedict's test?

Collect a urine sample from the individual being tested. Add Benedict's reagent to the sample and heat it in a water bath. If glucose is present in the urine, it will react with the Benedict's reagent and cause a color change. The intensity of the color change can be compared to a color chart to determine the concentration of glucose in the urine. This process would need to be repeated for each urine sample being tested.

7 - Investigating the effect of temperature on the respiration rate of germinating seeds.

Set up an experiment in which germinating seeds are exposed to different temperatures. The respiration rate of the seeds could be measured by monitoring the amount of oxygen consumed or carbon dioxide produced over a set period of time. The experiment would need to control for other variables such as the type of seed, the amount of water and nutrients provided, and the length of time the seeds have been germinating. Comparing the respiration rates of the different groups would determine the effect of temperature on the seeds' respiration rate.

8 - How does the concentration of salt in a solution affect the growth of bacteria?

Prepare a series of solutions with varying concentrations of salt, and inoculate each with a known amount of bacteria. The solutions would need to be incubated at a constant temperature for a set period of time, and the growth of the bacteria could be measured by counting the number of colonies or by using a spectrophotometer to measure the optical density of the solution. Comparing the growth rates of the bacteria in the different salt concentrations would determine the effect of salt on bacterial growth. Control variables such as pH, temperature, and nutrient availability would need to be kept constant.

9 - Can the concentration of nitrogen compounds in soil be determined using colorimetry?

Collect soil samples from different locations and extract the nitrogen compounds using a suitable method such as Kjeldahl digestion. The extracted compounds can then be analyzed using colorimetry, which involves adding a reagent that reacts with the nitrogen compounds and produces a color. The intensity of the color can be measured using a spectrophotometer, and the concentration of nitrogen compounds in the soil can be calculated based on the absorbance of the color. This process would need to be repeated for each soil sample being tested.

10 - Investigating the effect of different types of plant hormones on the growth of seedlings.

Set up an experiment in which seedlings are grown in different concentrations of plant hormones, with control variables such as light, temperature, and watering. The growth rate of the seedlings could be measured by tracking their height or mass over a set period of time. Comparing the growth rates of the different groups would determine the impact of the plant hormones on the seedlings' growth. The experiment could also include observations of other plant characteristics such as leaf size and color, root development, and overall health.

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11 - How does the concentration of salt in water affect the hatching rate of brine shrimp?

Set up multiple containers with different concentrations of salt water and add brine shrimp eggs to each container. The containers should be kept at a consistent temperature and light level. After a set period of time, count the number of hatched brine shrimp in each container and calculate the hatching rate. Comparing the hatching rates of the different containers would determine the effect of salt concentration on the hatching rate of brine shrimp.

12 - Can the rate of mitosis be determined using microscopy techniques?

Collect a sample of cells undergoing mitosis and prepare them for microscopy. Using a microscope, observe the cells and record the time it takes for each cell to complete each stage of mitosis. The rate of mitosis can then be calculated by dividing the time taken for each stage by the total time taken for the entire process. This process would need to be repeated for multiple cells to ensure accuracy and reliability of the results.

13 - Investigating the effect of different types of antibiotics on the growth of bacteria.

Culture bacteria in petri dishes with different concentrations of antibiotics. The growth of the bacteria can be observed and measured over a set period of time. The concentration of antibiotic that inhibits the growth of the bacteria can be determined, and the effectiveness of different types of antibiotics can be compared. Control variables such as temperature, humidity, and nutrient availability would need to be kept constant to ensure accurate results.

14 - How does the concentration of oxygen affect the respiration rate of crickets?

Set up a series of chambers with different concentrations of oxygen, ranging from low to high. Place crickets in each chamber and monitor their respiration rate by measuring the amount of oxygen consumed and carbon dioxide produced over a set period of time. The results can be analyzed to determine the effect of oxygen concentration on the respiration rate of crickets. Control variables such as temperature and humidity would need to be kept constant throughout the experiment.

15 - Can the concentration of glucose in blood be determined using glucose oxidase and spectrophotometry?

A sample of blood would be mixed with glucose oxidase, which converts glucose to hydrogen peroxide. The amount of hydrogen peroxide produced is proportional to the amount of glucose in the sample. A spectrophotometer would then be used to measure the absorbance of the sample at a specific wavelength, which is also proportional to the amount of hydrogen peroxide present. The concentration of glucose in the blood sample can then be calculated based on the absorbance reading and a standard curve generated using known concentrations of glucose. This process would need to be repeated for each blood sample being tested.

16 - Investigating the effect of different types of pesticides on the growth of bean plants.

Set up an experiment in which bean plants are grown in soil treated with varying concentrations of different pesticides. An appropriate range of concentrations and a suitable plant species would need to be chosen, along with control variables such as light, temperature, and watering. The growth rate of the plants could be measured by tracking their height or mass over a set period of time. Comparing the growth rates of the different groups would determine the impact of the pesticides on the plant's growth. Additionally, the health of the plants could be assessed by examining their leaves for signs of damage or discoloration.

17 - How does the concentration of light affect the growth of algae?

Set up multiple containers with different concentrations of light, ranging from low to high. In each container, add a sample of algae and monitor their growth over a set period of time. The growth rate of the algae can be measured by tracking their biomass or chlorophyll content. Comparing the growth rates of the different groups would determine the impact of light concentration on the growth of algae. Control variables such as temperature, nutrient availability, and water quality would need to be maintained to ensure accurate results.

18 - Can the presence of starch in leaves be determined using iodine solution?

Obtain a sample of the leaf and grind it into a fine powder. Add a few drops of iodine solution to the powder and observe the color change. If the solution turns blue-black, it indicates the presence of starch in the leaf. This process would need to be repeated for multiple leaves from different plants to ensure accuracy and reliability of the results. Control variables such as the age of the leaf and the time of day the sample is taken should also be considered.

19 - Investigating the effect of different types of plant nutrients on the growth of tomatoes.

Set up an experiment in which tomato plants are grown in soil with varying concentrations of different plant nutrients, such as nitrogen, phosphorus, and potassium. Control variables such as light, temperature, and watering would need to be maintained. The growth rate of the plants could be measured by tracking their height or mass over a set period of time. Comparing the growth rates of the different groups would determine the impact of the plant nutrients on the plant's growth. Additionally, the nutrient content of the tomato plants could be analyzed to determine if there is a correlation between the nutrient concentration in the soil and the nutrient content in the plant.

20 - How does the concentration of carbon dioxide affect the growth of marine plants?

Conduct an experiment in which marine plants are grown in water with varying concentrations of carbon dioxide. The carbon dioxide concentration could be controlled by bubbling different amounts of carbon dioxide gas into the water. The growth rate of the plants could be measured by tracking their height, mass, or chlorophyll content over a set period of time. Comparing the growth rates of the different groups would determine the impact of carbon dioxide concentration on the plant's growth. Other variables such as light, temperature, and nutrient availability would need to be controlled to ensure that any differences in growth rate are due to the carbon dioxide concentration.

21 - Can the concentration of protein in an egg be determined using the Biuret method?

To determine the concentration of protein in an egg using the Biuret method, the egg would need to be homogenized and the protein extracted. A Biuret reagent would then be added to the protein extract, which would cause a color change if protein is present. The intensity of the color change would be proportional to the concentration of protein in the egg. A standard curve could be created using known concentrations of protein to determine the concentration of protein in the egg sample. This process would need to be repeated for each egg being tested.

22 - Investigating the effect of different types of plant hormones on the root growth of seedlings.

Set up an experiment in which seedlings are grown in soil with different concentrations of plant hormones. An appropriate range of concentrations and a suitable plant species would need to be chosen, along with control variables such as light, temperature, and watering. The root growth of the seedlings could be measured by tracking their length or mass over a set period of time. Comparing the root growth of the different groups would determine the impact of the plant hormones on the seedling's root growth.

23 - How does the concentration of oxygen affect the respiration rate of goldfish?

Set up multiple tanks with goldfish and varying levels of oxygen concentration. The respiration rate of the goldfish can be measured by tracking their oxygen consumption or carbon dioxide production. The experiment would need to be conducted over a set period of time with control variables such as temperature and feeding schedules. Comparing the respiration rates of the different groups would determine the effect of oxygen concentration on the goldfish's respiration rate.

24 - Can the concentration of a specific hormone in blood be determined using ELISA?

ELISA (enzyme-linked immunosorbent assay) involves coating a microplate with a specific antibody that binds to the hormone of interest. The sample of blood is then added to the plate, and any hormone present in the sample will bind to the antibody. A secondary antibody that is linked to an enzyme is then added, which will bind to the hormone-antibody complex. The enzyme will then catalyze a reaction that produces a detectable signal, such as a color change. The intensity of the signal is proportional to the amount of hormone present in the sample, allowing for the concentration of the hormone to be determined. A standard curve can be created using known concentrations of the hormone to accurately quantify the concentration in the sample.

25 - Investigating the effect of different types of pollutants on the growth of watercress.

Set up an experiment in which watercress plants are grown in water contaminated with different types and concentrations of pollutants. The growth rate of the plants could be measured by tracking their height or mass over a set period of time. Comparing the growth rates of the different groups would determine the impact of the pollutants on the plant's growth. Control variables such as light, temperature, and watering would need to be kept constant to ensure accurate results. The types and concentrations of pollutants used in the experiment would need to be carefully chosen based on their potential impact on watercress growth and their relevance to real-world pollution scenarios.

26 - How does the concentration of light affect the rate of respiration in germinating seeds?

Set up a series of experiments in which germinating seeds are exposed to different intensities of light. The rate of respiration could be measured by tracking the amount of oxygen consumed or carbon dioxide produced by the seeds over a set period of time. The experiment would need to control for other variables such as temperature and humidity. Comparing the rates of respiration for the different light intensities would determine the impact of light concentration on the rate of respiration in germinating seeds.

27 - Can the concentration of nitrates in water be determined using colorimetry?

Prepare a series of standard solutions of known concentrations of nitrates. A sample of the water would be mixed with a reagent that reacts with nitrates to produce a colored product. The intensity of the color would be measured using a colorimeter, and the concentration of nitrates in the water can be calculated based on the intensity of the color and the concentration of the standard solutions. This process would need to be repeated for each water sample being tested.

28 - Investigating the effect of different types of disinfectants on the growth of bacteria.

Prepare a culture of bacteria and divide it into multiple groups. Each group would be exposed to a different type of disinfectant, while control groups would not be exposed to any disinfectant. The growth rate of the bacteria in each group would be measured over a set period of time, either by counting the number of colonies or by measuring the turbidity of the culture. Comparing the growth rates of the different groups would determine the effectiveness of each disinfectant on inhibiting bacterial growth.

29 - How does the concentration of salt in water affect the growth of duckweed?

Set up multiple containers of water with varying concentrations of salt. Add duckweed to each container and monitor their growth over a set period of time. The growth rate of the duckweed can be measured by tracking their surface area or biomass. Comparing the growth rates of the different groups would determine the impact of salt concentration on the growth of duckweed. Control variables such as light, temperature, and nutrients should be kept constant across all containers.

30 - Can the concentration of ethanol in different types of alcoholic beverages be determined using gas chromatography?

Use gas chromatography to separate the components of the alcoholic beverage sample. The ethanol would be detected and quantified using a detector such as a flame ionization detector. The concentration of ethanol in each sample can then be calculated based on the peak area or height of the ethanol peak in the chromatogram. This process would need to be repeated for each type of alcoholic beverage being tested.

31 - Investigating the effects of different types of exercise on heart rate and blood pressure.

Recruit a group of participants and randomly assign them to different exercise groups (e.g. running, cycling, weightlifting). Measure their heart rate and blood pressure before and after the exercise session. Repeat this process for each exercise group. Analyze the data to determine if there are any significant differences in the effects of the different types of exercise on heart rate and blood pressure. Control variables such as age, gender, and fitness level should be taken into account.

32 - How does the level of noise pollution affect the behavior and communication of animals?

Conduct a field study in which the behavior and communication of animals in areas with varying levels of noise pollution are observed and recorded. Control variables such as time of day, weather conditions, and animal species would need to be taken into account. The observations could include changes in vocalizations, movement patterns, and social interactions. Comparing the behavior and communication of animals in areas with different levels of noise pollution would determine the impact of noise on their behavior. Statistical analysis could be used to establish correlations between noise levels and changes in animal behavior.

33 - Investigating the effects of different types of fertilizers on plant growth and nutrient uptake.

Set up an experiment in which identical plants are grown in soil with different types of fertilizers. The growth rate of the plants could be measured by tracking their height or mass over a set period of time. Nutrient uptake could be measured by analyzing the nutrient content of the plants at the end of the experiment. Comparing the growth rates and nutrient uptake of the different groups would determine the impact of the fertilizers on plant growth and nutrient uptake. Control variables such as light, temperature, and watering would need to be kept constant.

34 - How does exposure to light pollution affect the migration and behavior of nocturnal animals?

Conduct a field study in which nocturnal animals are observed in areas with varying levels of light pollution. The behavior and migration patterns of the animals could be tracked using GPS or radio telemetry. Data on the animals' activity levels, movement patterns, and habitat use could be collected and compared between areas with different levels of light pollution. This would allow for an assessment of the impact of light pollution on nocturnal animals and their ecosystems.

35 - Investigating the effects of different types of water pollution on aquatic ecosystems and organisms.

Set up multiple tanks or containers with different types and levels of water pollution, such as oil spills, chemical runoff, or excess nutrients. Populate each tank with a variety of aquatic organisms, such as fish, algae, and invertebrates. Monitor the health and behavior of the organisms over a set period of time, noting any changes in growth, reproduction, or mortality rates. Comparing the results from each tank would allow for an assessment of the impact of different types of water pollution on aquatic ecosystems and organisms.

36 - How does exposure to electromagnetic radiation affect the growth and development of plants?

Set up an experiment in which plants are exposed to different levels of electromagnetic radiation, such as UV light or radio waves. The plants would need to be grown in a controlled environment with consistent light, temperature, and watering. The growth rate and development of the plants could be measured by tracking their height, leaf size, and overall health over a set period of time. Comparing the growth and development of the plants exposed to different levels of electromagnetic radiation would determine the impact of the radiation on the plants. Control groups of plants not exposed to radiation would also need to be included for comparison.

37 - Investigating the effects of different types of air pollution on respiratory function and lung health.

Recruit a sample of participants who are exposed to different types of air pollution, such as those who live near busy roads or industrial areas. Conduct lung function tests, such as spirometry, on each participant to establish a baseline measurement of their respiratory health. Repeat the tests after a set period of time to determine any changes in lung function. Comparing the results of participants exposed to different types of air pollution would determine the impact of each type on respiratory function and lung health. Other factors, such as age and smoking status, would need to be controlled for in the analysis.

38 - How does the level of acidity affect the growth and survival of aquatic organisms?

Conduct experiments in which aquatic organisms are exposed to different levels of acidity. The organisms could be placed in tanks with varying pH levels, and their survival and growth rates could be monitored over time. Control variables such as temperature, light, and food availability would need to be kept constant. Comparing the survival and growth rates of the different groups would determine the impact of acidity on the organisms. Additionally, other factors such as changes in behavior or reproduction could also be observed and analyzed.

39 - Investigating the effects of different types of food additives on human health and metabolism.

Conduct a literature review to identify the potential health effects of different food additives. Design a study in which participants consume a controlled diet with varying levels of the food additives being tested. Blood and urine samples could be collected at regular intervals to measure changes in metabolism and biomarkers of health. Statistical analysis would be used to determine if there are significant differences in health outcomes between the different groups.

40 - How does the level of UV radiation affect the growth and survival of plants?

Set up an experiment in which plants are grown under different levels of UV radiation. This could be achieved by using UV lamps of varying intensities or by placing the plants at different distances from a natural source of UV radiation, such as the sun. The growth rate, survival rate, and other relevant factors such as leaf size and chlorophyll content could be measured and compared across the different groups. This would help determine the impact of UV radiation on plant growth and survival. Control variables such as temperature, humidity, and watering would need to be carefully monitored and controlled to ensure accurate results.

41 - Investigating the effects of different types of drugs on human physiology and behavior.

Conduct a double-blind, randomized controlled trial with a group of participants who are given different types of drugs. The physiological and behavioral effects of the drugs would be measured through various tests and assessments, such as blood pressure, heart rate, cognitive function, and mood. The results would be analyzed to determine the impact of each drug on the participants' physiology and behavior, and any potential side effects or risks associated with each drug would be identified.

42 - How does the level of carbon dioxide affect the growth and development of plants?

Conduct an experiment in which plants are grown in controlled environments with varying levels of carbon dioxide. The growth rate, height, and biomass of the plants can be measured over a set period of time. The results can be compared to determine the impact of different levels of carbon dioxide on plant growth and development. Other variables such as light, temperature, and watering would need to be controlled to ensure that the results are accurate and reliable.

43 - Investigating the effects of different types of pesticides on non-target organisms and ecosystems.

Conduct a series of experiments in which different non-target organisms are exposed to varying concentrations of the pesticide. The organisms could be chosen based on their ecological importance, such as pollinators or soil microorganisms. The effects of the pesticide on the organisms could be measured by tracking their survival rates, reproductive success, or behavior. Additionally, the impact of the pesticide on the broader ecosystem could be assessed by monitoring changes in the abundance and diversity of other species in the area. Comparing the results of these experiments would provide insight into the potential ecological risks associated with the use of the pesticide.

44 - How does the level of atmospheric pollutants affect the growth and development of plants?

Set up an experiment in which plants are grown in controlled environments with varying levels of atmospheric pollutants, such as nitrogen dioxide or ozone. The growth rate, leaf area, and chlorophyll content of the plants could be measured over a set period of time. Comparing the growth rates and health of the plants exposed to different levels of pollutants would determine the impact of atmospheric pollutants on plant growth and development. Control variables such as light, temperature, and watering would need to be kept constant to ensure accurate results.

45 - Investigating the effects of different types of microorganisms on the digestive system and gut microbiome.

Conduct a study in which different groups of animals are exposed to different types of microorganisms, either through their diet or through direct exposure. The effects on their digestive system and gut microbiome could be measured through various methods such as analyzing fecal samples, measuring changes in gut pH, or monitoring the presence of certain bacteria. Comparing the results from the different groups would determine the impact of the microorganisms on the animals' digestive system and gut microbiome.

46 - How does the level of humidity affect the growth and survival of insects?

Conduct an experiment in which insects are exposed to different levels of humidity in a controlled environment. The survival rate and growth rate of the insects could be measured over a set period of time. The experiment would need to control for other variables such as temperature, food availability, and lighting. Comparing the survival and growth rates of the insects in different humidity levels would determine the impact of humidity on their growth and survival.

47 - Investigating the effects of different types of radiation on the genetic material and DNA replication.

Cultivate a sample of cells in a controlled environment and expose them to different types of radiation, such as gamma rays or UV light. The cells would then be monitored for changes in their genetic material, such as mutations or damage to DNA replication. The results could be compared to a control group that was not exposed to radiation to determine the effects of each type of radiation on the cells. Additional experiments could be conducted to investigate the long-term effects of radiation exposure on the cells.

48 - How does the level of soil salinity affect the growth and survival of plants?

Set up an experiment in which plants are grown in soil with varying levels of salinity. An appropriate range of salinity levels and a suitable plant species would need to be chosen, along with control variables such as light, temperature, and watering. The growth rate and survival rate of the plants could be measured by tracking their height, mass, and number of leaves over a set period of time. Comparing the growth and survival rates of the different groups would determine the impact of soil salinity on the plant's growth and survival. Additionally, the concentration of ions in the soil could be measured to determine the relationship between soil salinity and plant growth.

49 - Investigating the effects of different types of antibiotics on bacterial growth and antibiotic resistance.

Set up a series of petri dishes with agar and bacterial cultures. Each dish would contain a different antibiotic, with varying concentrations. The dishes would be incubated for a set period of time, and the growth of the bacteria would be measured. The results would show which antibiotics were most effective at inhibiting bacterial growth, and whether any resistance had developed. Control variables such as temperature, humidity, and the type of bacteria used would need to be carefully controlled to ensure accurate results.

50 - How does the level of soil pH affect the growth and survival of plants?

Conduct an experiment in which plants are grown in soil with varying pH levels. An appropriate range of pH levels and a suitable plant species would need to be chosen, along with control variables such as light, temperature, and watering. The growth rate of the plants could be measured by tracking their height or mass over a set period of time. Comparing the growth rates of the different groups would determine the impact of soil pH on the plant's growth and survival. Other factors such as nutrient availability and toxicity would also need to be considered and controlled for in the experiment.

51 - Investigating the effects of different types of hormones on animal behavior and physiology.

Conduct experiments with different groups of animals, each exposed to a different hormone. The behavior and physiology of the animals would be monitored and recorded over a set period of time. Control variables such as diet, environment, and age would need to be maintained across all groups. Comparing the results of the different groups would determine the effects of each hormone on the animals' behavior and physiology. Statistical analysis could be used to determine the significance of the results.

52 - How does the level of water availability affect the growth and survival of plants?

Conduct an experiment in which plants are grown in different levels of water availability, ranging from drought conditions to optimal watering. The growth rate, survival rate, and overall health of the plants would be monitored over a set period of time. The data collected would be used to determine the impact of water availability on plant growth and survival. Control variables such as light, temperature, and soil type would need to be kept constant to ensure accurate results.

53 - Investigating the effects of different types of plant extracts on bacterial growth and antibiotic resistance.

Prepare bacterial cultures in petri dishes with different concentrations of the plant extracts. The growth of the bacteria can be observed over a set period of time, and the effectiveness of the plant extracts in inhibiting bacterial growth and antibiotic resistance can be determined by comparing the growth rates of the different groups. Control variables such as temperature and nutrient availability would need to be kept constant to ensure accurate results.

54 - How does the level of nutrients affect the growth and development of microorganisms?

Conduct experiments in which microorganisms are grown in nutrient-rich and nutrient-poor environments. The growth rate and development of the microorganisms could be measured by tracking their population size and observing their morphology under a microscope. Comparing the growth rates and morphology of the microorganisms in the different environments would determine the impact of nutrient levels on their growth and development. Control variables such as temperature, pH, and oxygen levels would need to be kept constant.

55 - Investigating the effects of different types of pollution on the reproductive systems and fertility of animals.

Select a suitable animal species and expose them to different types of pollution, such as air pollution or water pollution. The reproductive systems and fertility of the animals could be monitored over a set period of time, and compared to a control group that was not exposed to pollution. The impact of the pollution on the animals' reproductive systems and fertility could be determined by analyzing factors such as the number of offspring produced, the health of the offspring, and any abnormalities or complications observed during pregnancy or birth.

56 - How does the level of light intensity affect the growth and development of microorganisms?

Set up multiple petri dishes with agar and different levels of light intensity, ranging from complete darkness to bright light. Inoculate each dish with the same strain of microorganisms and incubate them for a set period of time. The growth of the microorganisms can be measured by counting the number of colonies or by measuring the turbidity of the culture. Comparing the growth rates of the different groups would determine the impact of light intensity on the growth and development of the microorganisms. Control variables such as temperature, nutrient availability, and humidity would need to be maintained throughout the experiment.

57 - Investigating the effects of different types of food on the metabolism and energy balance of humans.

Conduct a randomized controlled trial in which participants are assigned to different groups and given different types of food to eat for a set period of time. The participants' energy intake, metabolism, and weight would be measured before and after the intervention to determine the impact of the different types of food on their energy balance. Other factors such as physical activity levels and sleep patterns would also need to be controlled for to ensure accurate results.

58 - How does the level of nutrients affect the growth and development of plants?

Conduct an experiment in which plants are grown in different nutrient solutions with varying levels of nitrogen, phosphorus, and potassium. The growth rate, height, and mass of the plants could be measured over a set period of time to determine the impact of the nutrient levels on their growth and development. Control variables such as light, temperature, and watering would need to be kept constant. The results could be analyzed to determine the optimal nutrient levels for plant growth and development.

59 - Investigating the effects of different types of hormones on plant growth and development.

Set up an experiment in which different groups of plants are treated with different types and concentrations of hormones. The growth rate, height, and mass of the plants could be measured over a set period of time. Control variables such as light, temperature, and watering would need to be kept constant. Comparing the growth rates of the different groups would determine the impact of the hormones on the plant's growth and development. Additional measurements such as leaf size, root length, and flower production could also be taken to further analyze the effects of the hormones.

60 - How does the level of water quality affect the growth and survival of aquatic organisms?

Set up multiple aquariums with varying levels of water quality, such as different levels of pollutants or pH. Introduce the same species of aquatic organism into each aquarium and monitor their growth and survival over a set period of time. The growth rate and survival rate of the organisms can be compared between the different aquariums to determine the impact of water quality on their growth and survival. Control variables such as temperature and feeding schedules should be kept consistent across all aquariums.

Remember to come up with your own original IA topic and check it with your teacher. It should be practical to conduct and relevant to the syllabus. Even A-Level Biology tutors say that this is a great opportunity to develop your personal interests, while advancing your knowledge of the Biology curriculum.

How can I prepare for the IA?

To prepare for the IA, students should ensure that they understand the material covered in their biology course and should practice writing lab reports. They should also seek feedback from their teachers on their writing skills and their understanding of the research process. IB tutors provide personalized guidance and can help students understand complex topics and achieve higher grades as well.

TutorChase's IB resources , including IB Biology Q&A Revision Notes , are perfect for students who want to get a 7 in their IB Biology exams and also prepare for the internal assessment. They are completely free, cover all topics in depth, also have IB Biology past papers and are structured by topic so you can easily keep track of your progress.

How is the IA graded?

The IA is worth 20% of the final grade for the IB biology course, whether you are studying at Higher or at Standard Level. It is graded by the student’s teacher, who is trained and certified by the International Baccalaureate organization. The report is then sent to a moderator, who will check that the report adheres to the IB guidelines and that the grade awarded is appropriate.

Online Biology tutors emphasise that it is important for students to be familiar with the assessment criteria for the biology internal assessment. These criteria are used to grade the laboratory report and reflective statement, and include aspects such as the quality of the research question, the methodology used, the data analysis, and the conclusion. Students should also make sure that their report is well-written and properly formatted, and that it includes all the required sections.

Recent Changes to the IB Biology IA Guidelines

The IB has recently updated the guidelines for the Biology IA to better reflect the evolving nature of biological research and education. These changes include a greater focus on the application of biological principles to real-world situations, a more structured approach to reflective statements, and updated word count and grading criteria. It is important for students to familiarize themselves with these changes to ensure they meet the new expectations.

Source: IB Biology Subject Guide, pre-May 2025

In summary, the IA in the IB is an opportunity for students to demonstrate their understanding of the biology curriculum, as well as their ability to conduct independent research. It consists of a laboratory report and a reflective statement, and is worth 20% of the final grade for the course. To prepare for the assessment, students should ensure that they understand the material covered in their IB Biology.

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Charles scored 45/45 on the International Baccalaureate and has six years' experience tutoring IB and IGCSE students and advising them with their university applications. He studied a double integrated Masters at Magdalen College Oxford and has worked as a research scientist and strategy consultant.

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30 Amazing IB Biology Internal assessment topics you can't overlook

A good assessment determines what skills you have acquired and how productively you can practice those skills though it does not support that you have to come up with a masterpiece. A topic connected to your area of interest, logical structure, and a valid research topic will get an outstanding score.

Still, Puzzled? Definitely a perfect IA topic won't come out of the blue for you; but we got your back.

Here is a quick listing of 30 interesting and unique topic selection ideas for your IB Biology internal assessment:

Human Physiology:

1. Examine the heart rate response to the baroreceptor feedback. 2. Does the reflex action slow down with the age? 3. Determine the Co2 level difference exhaled after and before a hard exercise. 4. What impact energy drinks have on BP and Heart rate after a physical workout? 5. Determine the stress types on the ventilation rate. 6. Determine muscle activity used in ballet dancing. 7. Find how music affects the heart rate of humans? 8. Analyze how human eyes respond to electronic gadgets screens. 9. Test the precision of color vision by online color tests.

Plant Biology:

10. Determine the effect of light and temperature on fruit ripening. 11. Investigate the mitotic index in the root tips such as Onion. 12. Research the effects of stomatal density on different plant types. 13. Do the impact house goods have on the growth of plants? 14. Study how salt concentration affects seed germination. 15. Are antibiotics effective for seed germination? 

Cell and Molecular Biology:

16. Determine the effect of sugar on the respiration rates of baker's and wine yeast. 17. Study the biological origin of Schizophrenia. 18. Explore human root hair cells and their visibility by age. 19. What happens to products after the sell-by date? 20. Investigation on DNA alteration and its possibilities. 21. Ethical essay on human cloning. 22. Examine the health effects of steroids on humans. 23. Examine the effect of the enzyme on the making of cheese. 24. The effect of carbohydrates on the blood sugar level.

Ecology and Environmental Biology

25. How do river pollutants affect the water species? 26. Effects of air pollutants on plants. 27. How do the abiotic components affect the biodiversity in a habitat? 28. How temperature effects in spreading of viral infections? 29. How does the sunlight affect the biomass? 30. How Global warming is affecting the human body?

Disclaimer: The topics suggested in this article are only for the motivational purpose and to give students some ideas of how you can link some real-world investigations with your IB chemistry internal assessment to score a good grade. 

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IB Biology: How to Come Up with the Best Biology IA Ideas?

Stuck on ideas for a good biology experiment? Scroll down to see a list of our best Biology IA experiment recommendations that will secure you top marks in your internal assessment!

a month ago   •   5 min read

Biology is one of the most challenging subjects in the IB program. IB Biology requires students not only to be proficient in the content but also to conduct their research and analysis. Many students can learn the content easily, however struggle with the IA due to its analytical nature.

Want to get a 7 in your Biology IA? Keep reading to find out how!

Overview of the Biology Internal Assessment

Before brainstorming ideas, it’s essential that you familiarise yourself with the IA and its requirements. Your Biology IA should:

• Align with a topic from the IB syllabus
• Be feasible within the time frame
• Allow you to collect sufficient data and have scientific papers written about it
• Be ethical, safe and manageable with the resources available to you

The IA contributes to 20% of your overall grade, and for most people is the difference between a 6 and a 7. This still leaves most of your grade left to your exams.

Want to know how to get a 7 on your exams? Check out our article below!

Brainstorming Broad Areas of Interest

Once you have a few broad topics in mind, do some preliminary research to explore specific questions or problems within those areas. Look for existing studies, articles, and online resources that discuss related experiments. This research will help you identify gaps in knowledge or areas where further exploration could be valuable.

For example, say you are interested in photosynthesis. You should then:

• Research key factors in photosynthesis
• Find articles and studies that discuss photosynthesis experiments
• Note their dependent and independent variables and the outcome of the experiment

Tip: a really helpful piece of advice is to look at Biology IA examples that score a 7 and see what topics they relate to. Having an exemplar to compare to yours will not only give you ideas but set you on the right path.

Refining your Idea

After having a few broad ideas, you must refine them. A good IA always has a clear research question that you can test through experimentation. The topic you choose should also include reasons for conducting research. The more focused your topic, the easier it will be to design a method and collect meaningful data.

Continuing with the photosynthesis example, say you find a lot of research on the plant Elodea :

• You find out that changing the salinity of the solution (salt concentration) affects the rate of photosynthesis
• Clearly state your independent variable (in this case salinity) and the dependent variable (in this case rate of photosynthesis)
• You should also find out why this research is applicable

You must then formulate an in-depth question that has these criteria:

• What independent variable are you changing (and by how much)
• What effect in the dependent variable are you collecting data on
• What are the units of the data you are collecting and how you are measuring it
• The time frame of the experiment

A good IA question will sound something like this:

What is the effect of increasing the salinity of the solution (0%, 1%, 2%, 3%, 4%, and 5%) on the rate of photosynthesis of Elodea canadensis as measured by the number of oxygen bubbles produced in 10 minutes?

This research question tells us:

• What independent is changing (salinity)
• The effect on the dependent variable (rate of photosynthesis)
• The units (oxygen bubbles)
• The time frame (10 minutes)

The research question is also applicable to real life. With rising sea levels, salinity on the shores is likely to increase due to erosion. What effect will this have on underwater plants?

The key to a good IA question ultimately lies in a specific dependent variable and independent variable, and whether it is providing useful information on a certain issue. 

The best Biology IA ideas

There are no ‘best’ IA ideas, however some topics are much easier to score a 7. Ensuring you follow the previous steps; your IA idea should already have research that you can reference to strengthen your analysis.

Here are some of KIS’ Biology IA recommendations:

1. Effect of Temperature on Enzyme Activity:

• DV: Rate of enzyme activity (measured by the breakdown of the substrate, such as hydrogen peroxide by catalase).
• IV: Temperature (varied using a water bath or incubator at different temperatures, e.g., 10°C, 20°C, 30°C, 40°C, 50°C).
• Experimental Setup: Create a potato paste (this contains catalase) with hydrogen peroxide. Change the temperature and measure the rate of oxygen production using a gas syringe.
• Rationale: This experiment investigates how temperature affects enzyme kinetics, which is crucial for understanding metabolic processes in living organisms.

2. Impact of Light Intensity on Photosynthesis Rate in Elodea Plants:

• DV: Rate of photosynthesis (measured by the oxygen produced, using a gas collection method).
• IV: Light intensity (altered by adjusting the distance of the light source or using different wattage bulbs).
• Experimental Setup: Submerge Elodea in a beaker containing water. Adjust the light intensities and measure the rate of oxygen produced either via counting bubbles or using an oxygen sensor.
• Rationale: Photosynthesis is essential for plant life, and understanding how light intensity influences this process is key to optimising plant growth in different environments.

3. Effect of Carbon Dioxide Concentration on Photosynthesis:

• DV: Rate of photosynthesis (measured by the rate of oxygen production or uptake of CO2).
• IV: CO2 concentration (varied using different concentrations of sodium bicarbonate in the water).
• Experimental Setup: Place aquatic plants like Elodea in solutions with varying CO2 concentrations, expose them to light, and measure the oxygen produced over time.
• Rationale: This experiment explores how CO2, a critical component of photosynthesis, affects the rate of this process, providing insights into plant responses to changing atmospheric conditions.

4. Effect of Substrate Concentration on Enzyme Activity:

• DV: Rate of enzyme activity (measured by the breakdown of starch using amylase or another enzyme-substrate pair).
• IV: Substrate concentration (varied by preparing solutions with different concentrations of starch).
• Experimental Setup: Mix amylase with starch solutions of varying concentrations and measure the rate of starch breakdown using iodine (which changes color when starch is present).
• Rationale: Understanding how substrate concentration affects enzyme activity is fundamental in biochemistry and has applications in industries that rely on enzyme-catalyzed reactions.

5. Temperature's Effect on Respiration Rate in Germinating Seeds:

• DV: Respiration rate (measured by CO2 production or oxygen consumption).
• IV: Temperature (varied using a water bath or incubator at different temperatures).
• Experimental Setup: Place germinating seeds in sealed containers at different temperatures, and measure the change in CO2 concentration using a gas sensor or chemical indicator.
• Rationale: Cellular respiration is temperature-sensitive, and studying how it varies with temperature helps understand the metabolic rates of organisms under different environmental conditions.

And that’s how you can come up with the best Biology IA Idea. This IA cannot be rushed, so take your time researching and planning to set yourself up for success.

Want more personalized study guidance to help drastically improve your marks? A private tutor can make the biggest difference!

Written by KIS Academics Tutor for IB and QCE, Sameer Baad. Sameer is currently studying for a Bachelor of Advanced Finance and Economics at the University of Queensland. You can view Sameer’s profile here and request him as a tutor.

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• 16 new experiment ideas for Biology IA
• The Investigation

This is a neat idea to immobilise algae in alginate beads and use them to investigate photosynthesis rate. The concentration of carbon dioxide in the solution can be measured using a data logger or an indicator like bicarbonate indicator can be used. This will work best if used in conjunction with a colorimeter. A range of factors could be tested including temperature, light intensity,frequency of light. Steps must be...

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Biology IA Topics: 20+ Great Ideas to Get You Started

by  Antony W

September 5, 2022

There’s nothing worse than trying to brainstorm and search for Biology IA topics only to come out empty.

The problem is:

There’s a lot to explore in Biology that it proves challenging to determine what topic would be suitable to investigate from the hundreds of possible options. So if you’re having a difficult time figuring out what topic to explore, we can understand.

In this post, we’ll share a list of the best IB Biology IA topics that you can use either for inspiration to help you come up with a topic of your own or as a modified topic for further research.

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IB Biology Internal Assessment (IA) Topics

Coming up with an IB Biology IA topic to explore isn’t difficult if you understand the requirements. Like Physics and Chemistry ,  your IA in Biology must focus on scientific writing and research in the Biology subject.

Below is a list of 30+ topic ideas for Biology Internal Assessment:

• Assessment of the effect of temperature on the vitamin C content of various juices
• What effect can quick shifts in body posture have on baroreceptor feedback and pulse rate?
• How do detergents, drinks, yogurt, and milk stack up when it comes to buffering?
• How does the ideal pH affect the growth rate of pinto and green beans? Proven Through Experiment
• The temperature dependence of the activation energy released during the decomposition of H2O2 utilizing the catalase enzyme and aluminum inhibitor as catalysts.
• To what extent does organic household waste affect the germination and emergence of tomato seeds?
• Investigating the Role of Carbonated Drink Volume and pH in Tooth Erosion/Decay
• In vitro Studies of Aluminum Chloride's Effects on the Liver Catalase Enzyme's Degradation of Hydrogen Peroxide
• Changes in seashell mass and carbon monoxide (CO) emitted during the reaction as a function of HCL concentration
• Does river pollution threaten the source of water for marine life?
• Fruit ripening as influenced by environmental factors including light and temperature
• How can we evaluate the respiration rates of wine yeast and baker's yeast in various sugar solutions?
• What happens to DNA movement as the concentration of the agarose gel changes?
• Compare the top and bottom 25 nations in terms of HDI and their rates of lung cancer-related mortality using secondary data.
• How does body mass index (BMI) affect the skin's surface temperature and the pace at which it recovers after exposure to cold?
• Hydrogen peroxide breakdown rate influenced by presence of various metal ions (H,O.).
• Using the Silver Nitrate titration method, how much variation exists between the chlorine concentrations (mg / L) of several locally accessible brands of treated water?
• How post-workout use of energy drinks affects cardiovascular function and blood pressure
• How do energy drinks affect blood pressure and heart rate following exercise?
• How do varying amounts of lactases affect the efficiency with which lactose and other disaccharides in milk are digested?
• Is there a correlation between the presence of home furnishings and stunted plant development?
• In terms of the pace of hydrochloric acid neutralization, as assessed by the difference in change in pH levels in 5 minutes, how do cumin and turmeric powder compare to indigestion tablets?
• What effect does zinc chloride concentration have on plaque development?
• What happens to the length of Citrus limon roots as the Oxytetracycline concentration is raised from 5 mg/L to 10 mg/L?
• Is there a correlation between the pH of spoiled milk and the temperature at which it was stored?
• How can the opposing effects of temperature and light intensity on the time it takes for photosynthesis to occur cancel each other out?
• How can the acidity of certain drinks contribute to tooth decay?
• What happens to your heart rate if you suddenly start working out hard, and how much of an effect does warming up have on your maximum heart rate
• How effective are natural antiseptics such as ginger and turmeric compared to store-bought alternatives?
• How potent are synthetic antibacterial treatments in comparison to natural antibacterial remedies?
• What effect does sodium chloride have on bougainvillea seed germination at various concentrations?
• What effect does soil composition have on the propagation of a plant's offshoots?
• How much does the amount of sodium nitrate powder used to preserve meat reduce its quality?
• For what reason does moringa seed and leaf extract (herbal medication) inhibit the growth of dandruff-causing Malassezia yeast (Pittosporum)?
• Which laundry detergent is best in breaking down lipids and getting rid of stains?
• When it comes to radishes, how does the salinity of the water effect their development rate?
• Does Gibberellic acid influence dolly Parton rose germination, and how does it react at various concentrations?

Assessed internally and moderated externally by the IB, Biology IA at SL and HL accounts for 25% and 20% of the final grades respectively. Your teacher will assess your work out of 24 based on well-defined assessment criteria. As such, you should work on a topic that you can explore comprehensively within the scope of the assignment.

Final Thoughts

The IB Biology IA assignment isn’t as lengthy as the extended essay in the same subject, but it can be quite involving. You’ll conduct extensive experiments and the writing process is going to be somewhat longer.

To have an easy time working on the subject, it’s best to choose a topic that interests you, so you can focus on an area that you’ve always wanted to explore.

Given that we’ve shared over30 topic ideas with you, you shouldn’t have a difficult time figuring out what to work on.

About the author 

Antony W is a professional writer and coach at Help for Assessment. He spends countless hours every day researching and writing great content filled with expert advice on how to write engaging essays, research papers, and assignments.

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IB Internal Assessment Biology topics that require experiment 🧫

Dive into the world of experiments with IB Internal Assessment Biology topics that require an experimental approach. This article provides an insightful list of ten topic suggestions for students exploring significant biological concepts. These Biology IA topics span diverse areas, including dental health, plant growth, and chemical reactions. Through these IB Internal Assessment Biology topics requiring an experiment, students get a unique opportunity to elevate their data collection, analysis, and scientific writing skills. So embrace the experimental journey with us.

10 Different Bio IA Topic Ideas to choose

Here are ten topic ideas for an IB Biology Internal Assessment that require an experiment, along with a brief explanation of what an IB student could do to work on these topics:

• The effect of volume and pH of carbonated drinks on the dental erosion or decay of teeth: 

This topic involves the study of the effects of different volumes and pH levels of carbonated drinks on the erosion or decay of teeth. An IB student could conduct an experiment to test the effects of different volumes and pH levels of carbonated drinks on teeth and analyze the results to determine the impact on dental health.

• The effect of different types of light on the growth of plants: 

This topic involves the study of the effects of different types of light on the growth of plants, including the intensity and wavelength of the light. An IB student could conduct an experiment to test the effects of different types of light on the growth of plants and analyze the results to determine the optimal conditions for plant growth.

• The effect of different temperatures on the rate of enzyme-catalyzed reactions: 

This topic involves the study of the effects of temperature on the rate of enzyme-catalyzed reactions, which are essential for many biological processes. For example, an IB student could conduct an experiment to test the effect of different temperatures on the rate of an enzyme-catalyzed reaction and analyze the results to determine the optimal temperature for the reaction.

• The effect of different concentrations of a chemical on the rate of a chemical reaction: 

This topic involves the study of the effects of different concentrations of a chemical on the rate of a chemical reaction, which can be influenced by the availability of reactants. For example, an IB student could conduct an experiment to test the effect of different concentrations of a chemical on the rate of a chemical reaction and analyze the results to determine the optimal concentration for the reaction.

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Diving Deep into the Internal Assessment: A Look at Biology Experimentation Topics 🧪

• The effect of different pH levels on the growth of bacteria: 

This topic involves the study of the effects of different pH levels on the growth of bacteria, which can be influenced by the acidity or basicity of their environment. For example, an IB student could conduct an experiment to test the effect of different pH levels on the growth of bacteria and analyze the results to determine the optimal pH for bacterial growth.

• The effect of different concentrations of oxygen on the respiration rate of yeast: 

This topic involves the study of the effects of different concentrations of oxygen on the respiration rate of yeast, which is an important process for the production of energy in cells. An IB student could conduct an experiment to test the effect of different concentrations of oxygen on the respiration rate of yeast and analyze the results to determine the optimal oxygen concentration for respiration.

• The effect of different types of fertilizers on the growth of plants: 

This topic involves the study of the effects of different types of fertilizers on the growth of plants, including the nutrient content and pH of the fertilizers. An IB student could conduct an experiment to test the effect of different types of fertilizers on the growth of plants and analyze the results to determine the optimal fertilizers for plant growth.

• The effect of different levels of salt on the germination of seeds: 

This topic involves the study of the effects of different levels of salt on the germination of seeds, which is the process by which a plant sprouts from a seed. An IB student could experiment to test the effect of different levels of salt on the germination of seeds and analyze the results to determine the optimal conditions for seed germination.

These ten IB IA Biology topic ideas provide various options for an IB Biology IA that involves an experiment. By selecting one of IB Internal Assessment Biology topics that require experiment, IB students can perform their research and improve their data collection, analysis, and scientific writing skills. 

You can also check some other article from IBWritingService.com :

• Physics IB IA Topic Ideas
• IB IA Topics for Environmental Science
• 25+ IB Chemistry IA Topics and How to Complete Them
• What is IA ESS
• ESS IA topics

In addition, these topics (you can aslo find topics for Math IA and good History IA ideas , as well offer students.

The chance to examine significant biological concepts and enhance their understanding of the scientific method, whether they are examining the impact of carbonated drinks on dental health or the best conditions for plant growth.

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12 Examples and Tips for IB Biology IA

May 4, 2022 | IB subjects

IA is one of the many things IB students struggle with, but some might feel that writing the IA in Biology is especially confusing since it covers broad topics. This post is for those who are having a hard time coming up with a topic, are worried about writing the IA in Biology overall, or are interested in Biology but not so sure about taking it because of IA. An overview of the subject IB Biology can also be seen in a previous post: Exam Strategy for IB Biology (HL/SL) .

1. Overview of Biology IA

Both HL and SL students are expected to write an IA ( Internal Assessment ) in Biology which accounts for 20% of the final grade . The IA in biology is expected to be a 6-12 pages long report about an investigation a student carries out based on their own hypothesis.

1.1 IA Criteria

HL and SL share the same IA criteria and it’s important to understand the criteria before and while carrying out the investigation for your IA. (Reference: Biology Teacher Support Material )

2. Examples of Biology IA Topics

Many IB graduates have kindly answered an online survey by MakeSensei and given examples of IA topics in IB Biology. Some of them are RQs (Research Questions), so you might want to see the pattern of how they make RQs for your future IA.

• What is the effect of exposure to different concentration of sodium chloride solutions for different duration time on the germination percentage, mean germination time, and relative injury rate of Ipomoea aquatica?
• Lactic acid experiment in milk
• What is the effect of sodium chloride concentration (0.0, 0.4, 0.8, 1.2, 1.6, and 2.0 %) on the rate of hydrolysis of 1.0 % starch solution by 2.0 % ɑ-amylase (Bacillus subtilis), measured as the rate of decrease in absorbance value (Au s–1), using Spectrophotometer Vis at 434.2nm?
• Protein-digestive enzyme
• What is the effect of fertiliser quantity on evening levels of dissolved oxygen in river water samples over a period of two weeks?
• An Investigation into the Effect of Different Types and Concentrations of Pesticides (Orthoran Acephate, Kadan Safe, Kadan Plus DX) on Seed Germination: Observing Plant Growth of ErucaSativa, Brassica Oleracea, Lepidium Sativum and Perilla Frutescens
• An investigation into the effect of sodium chloride on plant germination and its growth.
• (Title: How to make delicious natto) RQ: What is the effect of pre-soaking time of soybeans, 0.00, 3.00, 6.00, 9.00, and 12.00 hours (±0.05 hours), on the length of threads between separated fermented soybeans (natto) measured by a clear plastic ruler (±0.1cm)?
• Effect of light intensity on the travel activity of a Physella acuta
• Investigating the effect of concentration of the salt solution on germination and growth of cotton and spinach seeds
• Investigating the correlation of the length of knee roots of a mangrove and the number of holes crabs make in the given area
• Effect of temperature on denaturation of albumin protein

3. Tips for Biology IA

3.1 Set Appropriate Independent/Dependent Variables

In order to carry out the investigation with sufficient sample size and trials, there needs to be independent and dependent variables that are both appropriate in terms of the purpose of your investigation. If you want to find out the relationship between X and Y (how X influences Y), then your independent variable should be X and your dependent variable should be Y. Both variables should be measurable , meaning quantitative, to allow various statistical analyses. But having qualitative data is valued in discussion as well.

3.2 The More Data, The Better

It is known that you should have at least 25 samples of data for your Biology IA, but let us explain why. While having multiple trials is necessary for the investigation, each trial should also have multiple samples. Therefore, 5 trials with 5 samples each make up 25 samples in total. Having said that, your sample size is up to you, and having more than 25 samples would only make your data more robust . But make sure you have enough time and energy to process the whole data.

3.3 Use Appropriate Secondary Sources

Doing background research on the field you’re focusing on in IA is required to back up your hypothesis, discussion, and conclusion. A lot of people use secondary sources (sources that are not first-hand) and most often through the internet. But, using Wikipedia or personal blogs would not be appropriate for your IA because they may not be reliable, accurate information. Instead, you might want to use these websites to search for previous academic articles and journals.

• Google Scholar
• The World Factbook  (provides you data about the country of your interest)

3.4 Don’t Forget Annotations and Citations

• Annotations

An annotation is a short comment written near an image to give an explanation. Annotations are necessary when the image and its title don’t give enough explanation to specific objects in the image and your word count is limited. For example, when you’re showing your method with an image of instruments, readers might not understand why you chose those instruments to carry out your experiment. To avoid such inconvenience, annotations provide more detailed information than the title and the main text.

A citation is a short version of the reference to your source and it needs to be in-text or footnote. Every time you mention something that is not original or first-hand, you need to put citation(s) to prove where that statement comes from. If you miss citations, it will be considered plagiarism and you could fail the IB. Therefore, citations are important!! You could use  Citation Machine  to create a reference list and citation for each reference (check which style is preferred by your teacher).

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Biology IA Topics: HL and SL Level Ideas

Table of contents.

Hello, fellow IB enthusiasts! As a seasoned IB writer with extensive experience in the International Baccalaureate (IB) curriculum, I’m excited to share insights on Biology IA topics. For many of you learning Biology in the DP curriculum , either at the Higher Level (HL) or Standard Level (SL), the Internal Assessment (IA) is a crucial component. In my opinion, it’s not just an academic requirement but a fantastic opportunity to showcase your understanding and creativity.

What Is the IB Biology IA?

The IB Biology Internal Assessment (IA) is a crucial component of the International Baccalaureate (IB) Biology curriculum. It is a scientific research project that constitutes a significant portion of the final grade for students taking IB Biology, either at the Higher Level (HL) or Standard Level (SL). Here’s a breakdown of what the IB Biology IA involves:

• The IA is an independent research project where students must design, carry out, and write up a scientific investigation. It can be an experiment conducted in a laboratory, a data-based analysis, or a combination of both.
• A unique aspect of writing a Biology IA is that students can choose their research topic, allowing them to explore an area of personal interest within Biology. This autonomy aims to foster deeper engagement and enthusiasm in the subject.
• For HL students, the IA demands greater complexity and depth in their research. In contrast, SL students are expected to focus on clarity and thoroughness in a less complex investigation.
• The IA helps students develop essential skills such as critical thinking, analytical skills, scientific writing, and the ability to conduct scientific research. It’s a practical application of the knowledge and skills learned in the IB Biology course.
• While students conduct their IA independently, they are guided and supervised by their Biology teacher, who provides support and ensures that the IA adheres to the IB’s ethical guidelines and academic standards.

The IA is evaluated based on  specific criteria set by the IB . These include personal engagement, exploration (the formulation of a focused research question and methodology), analysis (data collection and processing), evaluation (discussing the results and limitations), and communication (structuring the report coherently with appropriate scientific language). This work contributes significantly (usually around 20%) to the final grade. So, avoid common mistakes in your IA in IB Biology course.

Biology IA Topics and Research Questions

Next, the choice of IA topic is crucial. It should match your interests and the resources available to you. I always advise students to choose themes they are genuinely interested in, making the research process more enjoyable. Below are some ideas to consider.

Unsure about budgeting for your IA? Our article on the cost of writing an IB Internal Assessment provides clear insights into potential expenses.

Standard Level (SL) Biology IA Topics

SL students fear not! Your IA topics can be just as engaging. You might want to consider more accessible but equally interesting topics. Perhaps a study on local ecosystems or a simple yet effective experiment on plant growth:

• Effect of pH on Enzyme Activity . How do varying pH levels affect the activity of amylase in starch digestion?
• Germination Rate in Different Conditions . How do various temperatures affect the germination rate of Phaseolus vulgaris (common bean)?
• Impact of Light on Plant Growth . Does the color of light affect the growth rate of a common houseplant, such as the spider plant?
• Antibacterial Properties of Natural Substances . How effective are different natural substances (e.g., garlic, honey) in inhibiting bacterial growth?
• Osmosis in Potato Cells . How do different salt concentrations affect the rate of osmosis in potato cells?
• Effect of Caffeine on Heart Rate in Daphnia . Does caffeine consumption affect the heart rate of Daphnia (water fleas)?
• Plant Responses to Wind Stress . How does exposure to wind affect the stem strength in young plants?
• Impact of Music on Plant Growth . Can different genres of music influence the growth rate of plants?
• Yeast Fermentation and Sugar Types . How do different types of sugar affect the rate of fermentation in yeast?
• Soil pH and Plant Growth . How does soil pH affect the growth of a certain type of vegetable (e.g., tomatoes)?
• Effect of Salt on Seed Germination . How does salt concentration in water affect seed germination in a specific plant species?
• Influence of Temperature on Vitamin C Degradation in Fruit Juice . Does storage temperature affect the rate of Vitamin C degradation in orange juice?
• Water Quality and Algae Growth . How do various pollutants (e.g., oil, detergent) affect algae growth in freshwater?
• Effect of Different Diets on Earthworm Growth . How do various soil compositions (organic, sandy, clay) influence the growth of earthworms?
• Plant Transpiration Under Different Humidity Levels . How do varying humidity levels affect the transpiration rate in a common houseplant?
• Impact of Different Fertilizers on Plant Growth . How do various types of fertilizers affect the growth rate of a specific plant species?
• Effect of Temperature on the Activity of Fruit Enzymes . How does temperature variation affect the enzymatic activity in fruits like pineapple?
• Study of Microbial Growth in Different Food Preservatives . How do different natural preservatives impact the growth of microbes in food?
• Investigating the Rate of Water Absorption in Different Soil Types . How do various soil types affect the rate of water absorption?
• Effects of Different Light Conditions on Fish Behavior . How do variations in light intensity and color influence the behavior of a common aquarium fish species?
• Carbon Dioxide Levels and Plant Respiration . How do different levels of carbon dioxide in the atmosphere affect the respiration rate in plants?
• Mold Growth on Bread in Different Environments . How do various environmental conditions (humidity, temperature) affect mold growth on bread?
• Impact of Exercise on Human Heart Rate . How does different intensity of physical exercise affect human heart rate?
• Comparing Vitamin C Levels in Fresh and Processed Foods . What is the difference in Vitamin C content between fresh and processed versions of the same fruit?
• Effect of Music on Memory Retention in Students . Does listening to music while studying affect memory retention in students?

In my opinion, SL IAs should balance simplicity with scientific rigor. Your focus should be on clear data collection methods and coherent analysis. Remember, a well-executed simple study can score as highly as a complex one.

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Higher Level (HL) Biology IA Topics

For my ambitious HL students, your Biology IA topics need to demonstrate a higher level of complexity. Consider themes that involve advanced experimental techniques or in-depth theoretical analysis:

• Genetic Diversity in Bacterial Colonies . How does UV radiation affect genetic mutation rates in E. coli bacteria?
• Enzyme Kinetics and Inhibitors . How do different concentrations of an inhibitor (e.g., heavy metals) affect the activity of a specific enzyme (e.g., catalase)?
• Photosynthesis Rate Under Different Light Intensities . How does light intensity affect the rate of photosynthesis in Elodea (waterweed) plants?
• Cellular Respiration in Yeast Under Various Temperatures . How do different temperatures affect the rate of cellular respiration in yeast cells?
• Impact of Pollutants on Soil Microbial Activity . How do different pollutants (e.g., pesticides, heavy metals) affect microbial activity in soil?
• Allelopathy and Plant Competition . How does the presence of allelopathic chemicals from one plant species affect the growth of a neighboring plant species?
• Effect of Electromagnetic Radiation on Plant Growth . Does exposure to low-level electromagnetic radiation influence the growth rate of plants?
• Animal Behavior: Aggression Levels in Betta Fish . How do different environmental conditions (e.g., tank size, presence of objects) affect aggression levels in Betta fish?
• Impact of Ocean Acidification on Marine Invertebrates . How does increased acidity in water affect the shell strength of marine mollusks?
• Bioaccumulation of Heavy Metals in Aquatic Organisms . How does exposure to different concentrations of a heavy metal (e.g., lead) affect its accumulation in a specific aquatic organism (e.g., fish)?
• Researching Genetic Variation in a Local Population . How does genetic variation manifest in a specific trait within a local population?
• Enzyme Activity Under High-Pressure Conditions . How does high pressure affect the activity of a specific enzyme in a plant or animal tissue?
• Studying the Impact of Microplastics on Aquatic Microorganisms . How do microplastics in water affect the health and growth of aquatic microorganisms?
• Effect of Different Light Spectrums on Photosynthetic Rates . How do different light wavelengths affect the photosynthesis rate in chlorophyll-containing cells?
• Investigating the Bioaccumulation of Nutrients in Aquatic Food Chains . How does nutrient concentration vary at different levels of a simple aquatic food chain?
• Studying the Effect of Antibiotics on Bacterial Conjugation . How do different antibiotics impact the rate of bacterial conjugation?
• The Effect of pH on Enzyme Structure and Function . How does pH variation affect the structure and function of a specific enzyme?
• Cell Signaling Pathways in Stress Responses . How do specific signaling molecules influence cell responses to environmental stress?
• Impact of Heavy Metals on Plant Root Morphology . How do heavy metals in soil affect the root morphology of a specific plant species?
• Behavioral Changes in Animals Exposed to Different Temperatures . How does exposure to varying temperatures affect the behavioral patterns of a specific animal species?
• The Role of Different Wavelengths in Plant Defense Mechanisms . How do plants exposed to different light wavelengths alter their defense mechanisms?
• Comparative Analysis of Mitochondrial Efficiency in Different Tissues . How does mitochondrial efficiency vary in different animal tissues?
• The Effects of Ocean Acidification on Coral Calcification . How does increased ocean acidity impact the calcification process in corals?
• Investigating Hormonal Effects on Plant Tropisms . How do different concentrations of growth hormones affect the tropic responses of plants?
• Impact of Temperature on Antibody-Antigen Reactions . How does temperature variation affect the efficiency of antibody-antigen binding in an immune response?

From my experience, HL students should focus on designing robust experiments and ensuring their research questions are clear and focused. The more detailed your experiment, the better your analysis can be.

The Bottom Line

In conclusion, choosing the right topic for your IA, whether in IB Biology HL or SL, can set the tone for your entire project. With the right approach and mindset, this assignment can be as enjoyable as it is educational. I encourage you to take this opportunity wholeheartedly. Happy researching, and remember that our expert writers at Buy IB IA are always ready to help you.

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Step by Step Guide to Writing Level 7 IB Biology IA

I. introduction, a. brief overview of ib biology ia.

The IB Biology Internal Assessment (IA) is a crucial component of the International Baccalaureate (IB) Biology curriculum . It serves as a substantial piece of written coursework in the form of a scientific report, focusing on a specific experiment. This undertaking provides students with an opportunity to delve into a topic of personal interest within the realm of biology, conduct experiments, analyze data, and communicate their findings effectively.

B. Importance of Achieving a Level 7

Securing a Level 7 in the IB Biology IA is highly coveted for several reasons. Given that the IB curriculum heavily emphasizes coursework, excelling in IAs can significantly impact your overall grade. Attaining a Level 7 demonstrates a deep understanding of scientific concepts, meticulous experimental design, thorough data analysis, and clear communication skills.

II. Understanding the Assessment Criteria

A. criteria breakdown, 1. personal engagement (2 marks).

Personal engagement involves selecting a topic and experiment that holds personal significance or relevance to the student. While topics often align with IB biology content, students have the flexibility to explore areas beyond the curriculum. Examples may include investigating factors affecting plant growth or studying solubility and diffusion patterns of substances. The key is to explain the relevance of the chosen topic to earn these two marks effortlessly.

2. Exploration (6 marks)

The exploration criterion encompasses providing relevant background information and context for the chosen topic. Thorough research is paramount here, incorporating scientific theory, external references, and IB biology concepts. A well-rounded exploration sets the stage for a robust experiment and hypothesis.

3. Analysis (6 marks)

Analysis begins with formulating a clear research question that includes both the independent and dependent variables. Crafting a hypothesis based on research and scientific theory is crucial. Methodology should be detailed yet accessible, with specific equipment measurements and uncertainty. Data collection, processing, and presentation should be meticulous, with multiple trials for reliability. The evaluation phase involves critical thinking, comparing results to the hypothesis, identifying strengths and weaknesses of the experiment, and reflecting on the process.

4. Communication (6 marks)

Effective communication is essential for conveying scientific theories and experiment findings. Proper formatting, labeling of tables and graphs, and adherence to citation and referencing styles (e.g., MLA or APA) are imperative. A well-structured IA with clear communication enhances readability and comprehension.

III. Final thoughts

In the pursuit of crafting a Level 7 IB Biology IA, don’t hesitate to seek reviews and feedback from your teacher—they’re not only there to guide you but also responsible for evaluating your IA. Their insights can provide invaluable direction, helping you refine your ideas, address any shortcomings, and ultimately enhance the quality of your IA. Additionally, it’s crucial to be mindful of common mistakes such as simple grammatical errors and inadequate labeling of equipment in the methodology section. Maintaining a well-structured layout with clear headers facilitates readability and comprehension, ensuring that your IA is easy to navigate for both you and the examiner.

Remember, the IA is not a task to be completed in a single sitting. Starting early and establishing a brief overview allows ample time for successive rounds of review and editing. By adopting an iterative approach, you can refine your experiment design, enhance your data analysis, and polish your communication. Embracing feedback, avoiding common mistakes, and adopting a diligent, iterative approach are key to achieving success in your IB Biology IA.

Select a topic that interests you personally and has relevance to biology. Consider areas covered in your IB biology coursework but don’t hesitate to explore beyond the curriculum if a particular aspect of biology intrigues you.

Follow a structured format with clear headings and subheadings. Ensure proper labeling of tables and graphs, and adhere to citation and referencing guidelines.

Conduct multiple trials for each experiment to enhance reliability. Use appropriate statistical tools to analyze data and draw meaningful conclusions.

Reflect on possible reasons for the discrepancy, considering experimental limitations and external factors. Compare your findings to existing research and scientific theory to provide context.

Effective communication is essential for conveying your experiment’s findings and scientific concepts. Clear formatting, labeling, and referencing contribute to a well-structured and comprehensible IA.

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IB Biology IA Topics That Don’t Require Experiment

Welcome to this guide on IB Biology IA topics that don’t require experiments! If you’re an IB Biology student, you probably know that the Internal Assessment is a significant part of your final grade. It provides a chance for you to demonstrate your understanding of biological concepts and apply them to real-world situations.

The purpose of this blog post is to provide you with an overview of non-experimental IA topics that can be explored within different areas of biology. These topics don’t require conducting actual experiments, making them accessible to students who may not have the necessary resources or opportunities.

Now, you might wonder what exactly an IA is and how it differs from an extended essay. An IA is an investigative project unique to the IB Biology course, where you design and carry out your own research. In contrast, an extended essay focuses on analyzing existing research and providing a thorough written analysis. Both assessments are important in their own right, but for the purpose of this guide, we are focusing specifically on non-experimental IAs.

When selecting a non-experimental IA topic, certain criteria should be kept in mind. Firstly, the topic should be relevant to the IB Biology syllabus, ensuring that you address key concepts and learning objectives. Secondly, consider the availability of resources such as scientific articles, publications, and data analysis tools, as they will be essential in guiding your investigation. Finally, think about the feasibility of the topic in terms of materials, equipment, and time constraints.

Throughout the remainder of this guide, we will explore various non-experimental IA topic ideas covering different areas of biology. We will delve into Cell Biology, Molecular Biology, Ecology, Genetics, Evolution and Biodiversity, and human physiology, offering you a range of options to choose from based on your interests and strengths.

By the end of this guide, you will have a solid grasp of the potential non-experimental IA topics available to you. Remember, while experiments are not necessary for these investigations, approaches such as literature reviews, data analysis, computer simulations, and mathematical modeling can be highly effective in addressing your research question.

So without further ado, let’s dive into the world of IB Biology IA topics that don’t require experiments!

• Comparative Analysis of Genetic Mutations in Different Cancers: Utilizing available databases on genetic mutations to determine commonalities and differences.
• Effect of Climate Change on Migratory Patterns of Birds: Analysis based on existing datasets from birdwatching databases.
• Correlation between Human Development Index (HDI) and Prevalence of Infectious Diseases: An investigation using World Health Organization (WHO) and United Nations databases.
• Bioinformatics Analysis of Protein Sequences: Analyzing sequences to predict protein structures and their potential functions.
• Evolutionary Relationships among Cetaceans: Using genetic databases to understand the relationships and evolutionary paths.
• Review of the Impacts of Microplastics on Marine Life: A literature-based study of published research on the ingestion and impact of microplastics.
• Role of Gut Microbiota in Human Health: Using secondary data to explore how variations in gut bacteria might relate to diseases like obesity, diabetes, or even mental health conditions.
• Analyzing Trends in Antibiotic Resistance Globally: Utilizing global datasets to identify alarming trends and potential future challenges.
• Molecular Mechanisms behind Alzheimer’s Disease: A review-based study focused on recent scientific literature.
• Comparing Carbon Sequestration Rates among Different Forest Types: Using existing datasets to analyze which forests might be most effective in combating climate change.
• Review of Current Strategies in Organ Transplant Rejection Prevention: Looking at recent medical literature to assess the latest advancements and their effectiveness.
• Role of Epigenetics in Human Development and Disease: An exploration based on existing literature and datasets.
• Impact of Endocrine Disruptors on Aquatic Species: Using data from ecological studies to examine how these chemicals affect the physiology and reproductive capacities of aquatic life.
• Trends in Bee Population Decline and Its Implications on Global Food Chains: Using available datasets to analyze potential future impacts.
• The Relationship between Genetic Markers and Predisposition to Mental Health Disorders: An analysis based on available genetic and epidemiological data.
• Review of the Biotechnological Applications of CRISPR-Cas9 in Agriculture: Understanding the benefits and potential risks.
• Analysis of Disease Outbreaks and Their Relationship to Climate Anomalies: Using WHO data and global climate data to draw potential correlations.
• The Biochemical Mechanisms of Different Diets on Human Health: A review of ketogenic, vegan, Mediterranean, and other diets.
• Correlation between Pollution Levels and Asthma Prevalence in Urban Centers: Utilizing health and environmental data to draw connections.
• Evolution of Resistance Mechanisms in Bacteria against Common Antibiotics: A review of literature to track the evolutionary changes in bacterial genomes in response to antibiotic pressure.

Importance of IA

The Internal Assessment plays a crucial role in the IB Biology curriculum and has a significant impact on the final grade. Understanding the importance of IA can help students approach their assessments with the right mindset and maximize their chances of success.

Firstly, the IA allows students to apply the knowledge and skills they have acquired throughout the course in a practical and meaningful way. It is an opportunity for students to showcase their understanding of key biological concepts and demonstrate their ability to conduct scientific investigations.

Secondly, the IA is designed to promote critical thinking and develop essential scientific skills, such as experimental design, data analysis, and evaluation. By engaging in the IA process, students learn how to plan experiments, collect and analyze data using appropriate techniques, and draw valid conclusions based on their findings.

Additionally, the IA enables students to demonstrate their ability to work independently and manage their time effectively. It requires careful planning, organization, and adherence to deadlines, which are crucial skills for success in higher education and beyond.

Making the most of the IA also holds immense value when it comes to the final grade. Typically, the IA contributes to a percentage of the overall mark in IB Biology. A well-executed IA can significantly boost a student’s grade, while a poorly thought-out or incomplete IA may impact their final result. Therefore, investing time and effort into the IA is vital to achieving academic success in IB Biology.

It is worth noting that the IA allows students to explore topics of personal interest within the broader scope of the subject. This flexibility provides students with the opportunity to further motivate themselves and make connections between the study of biology and real-world situations or local contexts.

• In conclusion, the IA in IB Biology holds immense importance as it enables students to apply their knowledge, develop scientific skills, and manage their time effectively. It factors into the final grade and offers students the chance to immerse themselves in topics they are passionate about. Therefore, students should embrace the IA as a valuable opportunity to showcase their understanding and shine in their biology studies.

Definition of IB Biology IA

Welcome to the section where we shed light on what exactly an IA is in IB Biology, its purpose, and how it differs from an extended essay. If you’re new to the world of IB Biology Internal Assessments (IAs), don’t worry – we’ve got you covered!

An IA, short for Internal Assessment, is a crucial component of your IB Biology course. It is an opportunity for you to showcase your scientific skills, knowledge, and understanding by conducting independent research on a chosen topic. Unlike exams, IAs offer you the chance to explore a specific area of biology that truly fascinates you.

The purpose of an IA is to encourage you to think critically, apply key biological concepts, and engage in the investigative process like a professional biologist would. Through your IA, you’ll learn valuable experimental techniques, enhance your data analysis skills, and develop your ability to communicate scientific ideas effectively – all of which are vital for your future academic and scientific pursuits.

Now, you might be wondering how an IA differs from an extended essay. Well, the main distinction lies in their focus and scope. While an IA allows you to explore a more narrow and specific research question within a particular area of biology, an extended essay offers a broader exploration of a biology-related topic. The IA emphasizes experimentation, data collection, and analysis, whereas the extended essay prioritizes in-depth literature research and an extensive review of existing knowledge and theories.

To put it simply, an IA is an opportunity for you to flex your scientific muscles by conducting original research within a focused framework, while an extended essay is a chance for a more extensive exploration of an academic subject.

So now that we’ve clarified what an IA is and how it differentiates from an extended essay, you can approach your IA with a clearer understanding of its purpose and expectations. Get ready to dive into the world of IB Biology IA topics that don’t require experiments!

(Note: This section provides a simple yet informative introduction to the concept of an IA in IB Biology, catering to a reading grade eight level. The actual blog post will expand on this explanation and provide further details.)

Criteria for selecting non-experimental IA topics

When choosing a non-experimental Internal Assessment (IA) topic for IB Biology, there are several criteria to keep in mind. These criteria include relevance to the syllabus, availability of resources, and feasibility.

• Relevance to the syllabus: It’s important to select a topic that aligns with the concepts and content covered in the IB Biology syllabus. Choose a topic that allows you to explore and analyze biological principles in depth, ensuring it is directly related to the subject matter.
• Availability of resources: Consider the availability and accessibility of relevant resources when selecting your IA topic. This includes scientific research articles, textbooks, online databases, and other sources of information and data. Ensure that you have access to a range of supportive resources that will allow you to gather accurate information and support your analysis.
• Feasibility: Your IA topic should be feasible within the given time frame and available resources. Consider the practical aspects, such as the equipment, materials, and techniques required for an experiment-free investigation. By choosing a topic that is realistic and manageable, you can avoid unnecessary challenges and setbacks.

By considering these criteria, you can select a non-experimental IA topic that is relevant, well-supported, and achievable. It’s important to carefully evaluate potential topics against these criteria to ensure a successful IA project.

One example of a non-experimental IA topic that meets these criteria is the investigation of DNA sequencing techniques. While not an experimental procedure itself, analyzing and comparing existing DNA sequencing methods can provide valuable insights into their advantages, disadvantages, and applications in genetic research. This topic is highly relevant to the syllabus, readily supported by resources such as scientific journals, and feasible to conduct within the given constraints.

Remember, your IA topic should offer opportunities for deep analysis, critical thinking, and a demonstration of your understanding of biology concepts. By selecting a non-experimental IA topic that meets these criteria, you can confidently embark on your IA journey and produce a high-quality investigation.

Non-Experimental IA Topic Ideas Related to Cell Biology

If you are taking IB Biology and looking for IA topics that don’t require experiments, the field of Cell Biology can offer some intriguing options. Here are a few ideas to get you started:

• Cellular aging: Investigate the impact of factors like oxidative stress or telomere length on cellular aging. Explore the relevance of these findings in understanding the aging process in organisms.
• Drug targeting: Examine different drug delivery approaches for targeting specific cell types using nanotechnology, focusing on their effectiveness and potential applications in medicine.
• Cell communication: Explore the role of signaling molecules, such as hormones or neurotransmitters, in intercellular communication. Investigate the importance of cell signaling pathways in physiological processes.
• Cancer cell behavior: Analyze different cellular behaviors associated with cancer, such as uncontrolled proliferation or resistance to apoptosis. Investigate potential molecular mechanisms behind these behaviors and their implications for cancer treatment.
• Plant cell specialization: Study the differentiation of plant cells into various specialized types, such as parenchyma, collenchyma, or sclerenchyma cells. Investigate the functional implications of these specialized cells in plant development and physiology.

Each of these topics offers a unique perspective on cell biology and provides an opportunity for you to delve deeper into understanding fundamental cellular processes. By exploring these areas, you’ll gain valuable insights into the complexities of cell structure and function.

Remember, when choosing a non-experimental IA topic in cell biology, consider the relevance to the syllabus and your own interests. Additionally, ensure that resources, such as scientific journals, books, or online databases, are readily available for conducting research.

In order to investigate these non-experimental IA topics, you can rely on existing literature, data analysis, computer simulations, or even mathematical modeling. Analyzing and synthesizing information from reliable sources will allow you to generate valuable insights without performing actual experiments.

Don’t be afraid to be creative! Take advantage of the vast body of knowledge in cell biology and explore areas that pique your curiosity. By selecting a non-experimental IA topic in cell biology, you can make meaningful contributions to the field while showcasing your investigative and analytical skills.

Continue reading to discover more non-experimental IA topic ideas in other areas of biology!

Non-experimental IA topic ideas related to Molecular Biology

In IB Biology, there are numerous fascinating non-experimental IA topics that you can explore within the field of Molecular Biology. These topics allow you to delve into the intricate world of molecules and their interactions, without needing to conduct experiments.

• Gene expression regulation: Investigate the mechanisms by which genes are switched on or off in different organisms. Explore the importance of transcription factors, histone modification, and DNA methylation in gene expression. You could analyze existing research studies or use databases to collect data and draw conclusions about gene expression patterns.
• Protein folding and misfolding: Examine the folding process of proteins, exploring factors such as pH, temperature, and presence of chaperones that affect proper folding. Research the consequences of protein misfolding, such as neurodegenerative diseases, and propose strategies to prevent or treat these conditions by targeting protein misfolding pathways.
• Genetic engineering of crops: Investigate how genetic engineering techniques, such as using CRISPR-Cas9, can be used to modify plant genomes. Focus on specific genes involved in crop improvement, such as disease resistance or increased nutritional content, and discuss the potential benefits and ethical considerations of genetically modified crops.
• Molecular basis of cancer: Explore the molecular mechanisms underlying cancer development and progression. Analyze the role of oncogenes, tumor suppressor genes, and epigenetic modifications in the initiation and growth of tumors. Discuss targeted therapies that exploit these molecular targets for the treatment of cancer.
• Antibiotic resistance: Investigate the molecular mechanisms behind antibiotic resistance in bacteria. Evaluate the role of horizontal gene transfer, genetic mutations, and the misuse of antibiotics in promoting resistance. Propose effective strategies to combat antibiotic resistance and prevent the emergence of multidrug-resistant bacterial strains.

These non-experimental IA topics within Molecular Biology provide opportunities for in-depth research and analysis, without the need for practical experiments. You can delve into biological databases, scholarly articles, and real-world applications to enrich your exploration of these exciting topics.

When conducting your IA research, don’t forget to maintain academic integrity by citing your sources properly and critically analyzing the information you gather. Additionally, consult your teacher for guidance on resources and experimental procedures that can complement your non-experimental IA journey. Remember, exploring molecular biology through a non-experimental lens can be just as rewarding and insightful as conducting hands-on experiments.

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Non-experimental ia topic ideas related to ecology:.

If you’re interested in studying the interactions between organisms and their environments, ecology offers a wide range of non-experimental IA topic ideas. These topics allow you to explore ecological concepts and understand the intricate webs of life without conducting actual experiments. Here are a few ideas to spark your creativity:

• Investigating the impact of invasive species:  Analyze the ecological consequences of invasive species in a particular ecosystem. Collect and analyze existing data on the abundance and distribution of native and invasive species, and examine how the invasion affects biodiversity and native community dynamics.
• Examining the effects of climate change on species distribution:  Use existing data or maps to study how climate change alters the ranges of different species. Analyze trends and patterns in species distribution over time to determine how climate change influences the ecological makeup of an area.
• Assessing the effectiveness of wildlife conservation strategies:  Choose a specific conservation strategy, such as protected areas or habitat restoration programs, and evaluate its success in preserving biodiversity. Explore scientific literature and reports to gather data and assess the importance of these strategies in maintaining ecosystems.
• Analyzing the impact of pollution on aquatic ecosystems:  Investigate the effects of various pollutants, such as industrial chemicals or agricultural runoff, on the health of aquatic ecosystems. Collect and analyze water quality data, assess the ecological consequences of pollution, and propose mitigation measures.

When analyzing these non-experimental IA topics in ecology, it’s important to incorporate appropriate data analysis or modeling approaches:

• Data analysis:  Utilize statistical methods such as regression analysis, t-tests, or chi-square tests to evaluate patterns or associations in ecological data sets.
• Computer simulations:  Develop and run computer simulations to explore how changes in ecological variables affect ecosystem dynamics, species interactions, or population growth.
• Mathematical modeling:  Use mathematical models, such as population growth models or food web dynamics models, to examine theoretical scenarios or predict ecological trends.

Remember, your IA topic should adhere to IB Biology guidelines and align with your interests and available resources. By delving into ecological non-experimental IA topics, you can deepen your understanding of the complex relationships between organisms and their environments.

Non-experimental IA topic ideas related to Genetics

When it comes to genetics, there are numerous non-experimental IA topics that you can explore. These topics allow you to delve into specific genetic processes, inheritance patterns, or genetic disorders without conducting actual experiments. Let’s explore some fascinating ideas below:

• The role of genetic mutations in the development of cancer:  Investigate the different types of genetic mutations found in cancer cells and how they contribute to the initiation and progression of tumors.
• The impact of genetic testing on predicting and preventing inheritable diseases:  Examine the use of genetic testing in identifying individuals at risk for inheritable diseases and discuss the ethical concerns surrounding this practice.
• Analyze the inheritance patterns of genetically inherited disorders:  Explore how various genetic disorders are inherited, such as cystic fibrosis or Huntington’s disease, by studying family pedigrees and genetic profiles.
• The influence of genetic factors on behavior:  Investigate the role of genetics in shaping behavioral traits, such as intelligence, aggression, or addictive tendencies, by analyzing studies involving twins or adoption.
• Genetic engineering and its ethical implications:  Examine the ethical considerations surrounding the use of genetic engineering techniques, such as CRISPR, to modify the genomes of organisms, including humans.
• The genetics of taste perception:  Explore the genetic basis for differences in taste perception among individuals, examining specific genes involved in taste receptors and discussing their impact on food preferences.
• Genetic variations in drug response:  Investigate how genetic variations influence an individual’s response to specific drugs, focusing on identifying genetic markers associated with drug efficacy or adverse reactions.

Each of these non-experimental IA topics provides an opportunity to gain a deeper understanding of genetics and its applications. By exploring the particular genetic processes, inheritance patterns, or genetic disorders associated with these topics, you can showcase your knowledge and research skills without the need for experimental work.

Remember, when selecting a topic, consider its relevance to the IB Biology syllabus, the availability of resources, and the feasibility of conducting research in a non-experimental manner. Genetics offers a multitude of fascinating study opportunities that will allow you to explore the intricacies of inheritance, gene expression, and genetic disorders.

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Non-experimental IA topic ideas related to Evolution and Biodiversity

When it comes to studying evolution and biodiversity, conducting experiments can be challenging. However, that doesn’t mean you can’t explore fascinating topics in this field for your IB Biology IA. Here are some non-experimental IA topic ideas that delve into the key evolutionary concepts and patterns:

• Comparative analysis of homologous structures:  Investigate different organisms and examine how their similar anatomical features suggest a common ancestor. Explore the concept of divergent evolution and predict similarities in anatomical structures in organisms with shared ancestry.
• Investigating adaptive radiation:  Analyze a group of organisms that have evolved from a common ancestor but now occupy diverse habitats or exhibit various adaptations. Explore the ecological factors driving this radiation and discuss the underlying mechanisms of speciation.
• Studying convergent evolution:  Select different organisms from diverse taxonomic groups and explore similar traits, such as wings in bats and birds, despite not having a recent common ancestor. Investigate the environmental pressures leading to the development of analogous structures.
• Examining biogeography and evolutionary history:  Focus on a specific region and investigate the distribution of related species across different habitats. Analyze the impact of historical events and environmental changes on the evolution and distribution of these organisms.
• Investigating coevolutionary relationships:  Choose two or more interacting species and explore how their evolutionary histories have influenced and shaped each other. Discuss examples of mutualistic relationships, predator-prey coevolution, or host-parasite interactions.

These non-experimental IA topics related to evolution and biodiversity provide you with ample opportunities to research and analyze the incredible diversity of life on Earth. Remember, even though you won’t be conducting hands-on experiments, it’s essential to gather information from reliable sources and critically evaluate the existing knowledge and theories in the field.

A well-structured IA focusing on key concepts and patterns of evolution will demonstrate your understanding of the subject matter and critical thinking skills. Make sure to document your research process, including proper citations and references to ensure academic integrity.

By tackling these non-experimental IA topics linked to evolution and biodiversity, you can gain a deeper appreciation for the complex processes that have shaped the natural world. These projects allow you to delve into the fascinating principles of evolution and explore the incredible diversity of life around us without the need for experimental components.

Non-experimental IA topic ideas related to human physiology

When it comes to exploring human physiology for your IB Biology IA, you don’t always have to conduct experiments. There are plenty of non-experimental IA topic ideas that can shed light on various aspects of the human body. These topics focus on different body systems and specific physiological processes that play a crucial role in maintaining our health and well-being.

1. Body temperature regulation:  Investigate how the human body regulates its temperature under different environmental conditions, such as extreme cold or heat. Explore the physiological mechanisms involved and discuss their importance in maintaining homeostasis.

2. Respiratory system efficiency:  Analyze the factors affecting lung capacity and how they can contribute to variations in respiratory efficiency among individuals. Explore the relationship between lung capacity and physical fitness levels.

3. Cardiac output and exercise:  Examine the changes in cardiac output during exercise and investigate the influence of factors such as heart rate, stroke volume, and blood pressure on overall cardiovascular health.

4. Effects of stress on the immune system:  Explore how chronic stress can undermine the effectiveness of the immune system and increase susceptibility to infections and diseases. Discuss the physiological mechanisms involved and potential coping strategies.

5. Role of hormones in puberty:  Investigate the role of hormones in the onset of puberty, focusing on the interactions between the hypothalamus, pituitary gland, and reproductive organs. Discuss the physiological changes that occur during this developmental stage.

6. Impact of sleep deprivation on cognitive function:  Explore the effects of sleep deprivation on cognitive processes such as memory, attention, and decision-making. Discuss the underlying physiological mechanisms and potential strategies to improve sleep quality.

• 7. Impact of nutrition on metabolism:  Analyze the effects of different dietary components, such as carbohydrates, fats, and proteins, on metabolism and energy production in the human body. Contrast the benefits and drawbacks of various nutritional approaches.

These non-experimental IA topics provide ample opportunities to delve into the fascinating world of human physiology. They allow you to explore the intricacies of our body systems and understand how physiological processes contribute to our overall health. While conducting experiments is undoubtedly valuable, investigating these non-experimental topics will also equip you with critical research and analysis skills essential for success in IB Biology.

(Note: Remember to adjust and expand the content based on your personal preferences and available resources.)

Study Design and Methodologies

When designing and structuring a non-experimental Internal Assessment (IA) for IB Biology, there are several methodologies you can consider. While traditional experiments involve conducting hands-on research, non-experimental IAs focus on analyzing existing data, literature review, computer simulations, or mathematical modeling to answer your research question. Here are some options to explore:

• Literature Review:  Conduct a comprehensive review of scientific articles, books, or published research papers. Summarize and synthesize the findings from these sources to address your research question.
• Data Analysis:  If relevant data sets are available, analyze and interpret the data to draw conclusions. You can use statistical tests, graphs, or charts to present your findings effectively.
• Computer Simulations:  Utilize computer software or online simulations to model biological processes or phenomena. These simulations rely on mathematical algorithms, allowing you to test various scenarios and observe outcomes without conducting physical experiments.
• Mathematical Modeling:  Develop mathematical equations or models to represent biological systems or interactions. By inputting different variables into these models, you can simulate the behavior or predict the outcomes of specific biological phenomena.

Regardless of the methodology chosen, it is important to demonstrate critical thinking skills, data interpretation abilities, and a sound understanding of the topic. Organize your IA in a clear and logical manner, using appropriate headings and subheadings to aid readability. Make sure to include the following sections:

• Introduction:  Clearly state your research question or problem you aim to address. Provide an overview of the biological concepts and background information necessary to understand your IA.
• Methodology:  Describe the chosen methodology in detail. Explain why it is suitable for your research question and indicate any limitations or potential biases that may affect the validity of your findings.
• Data Analysis:  Present and analyze the data, simulations, or mathematical models you have utilized. Use appropriate statistical tools, graphs, and visuals to enhance the understanding of your findings.
• Discussion:  Interpret your results in relation to your research question. Address any inconsistencies or limitations in your study and propose areas for further exploration or improvement.
• Conclusion:  Summarize the key findings and their significance. Reflect on the strengths and weaknesses of your IA, suggesting potential implications and future directions for research in the field.

Remember, non-experimental IAs encourage critical thinking, analysis, and creativity while acknowledging the limitations and constraints of not conducting primary research. Through careful method selection and thoughtfully crafted investigations, you can still provide valuable insights and contribute to the field of IB Biology.

In this guide, we have explored the world of IB Biology IA topics that don’t require experiments. We began by understanding the significance of the Internal Assessment (IA) in IB Biology and its impact on the final grade. The IA provides students the opportunity to showcase their understanding of key biological concepts and skills.

An IA differs from an extended essay in that it is more focused and practical. It requires students to apply their knowledge and skills to analyze data, evaluate scientific information, and make informed conclusions.

When selecting non-experimental IA topics, several criteria should be kept in mind. The topic should align with the syllabus and cover relevant concepts. Additionally, the availability of resources and feasibility are vital factors to consider.

We have provided lists of non-experimental IA topics across various fields of biology. In the realm of Cell Biology, topics such as membrane transport and cell signaling offer intriguing research avenues. Molecular Biology opens possibilities in gene expression, DNA replication, and protein synthesis. Ecology allows for investigations into population dynamics and ecological modeling. For those interested in Genetics, topics like genetic inheritance and the study of genetic disorders present interesting avenues for exploration. The realm of Evolution and Biodiversity delves into fascinating themes of speciation and adaptation. Lastly, in human physiology, topics focused on body systems like respiration and cardiovascular function can be explored without direct experimentation.

When designing a non-experimental IA, there are various methodologies available, such as literature review, data analysis, computer simulations, or mathematical modeling. Choosing an appropriate methodology depends on the topic and research question at hand.

To conclude, non-experimental IA topics provide an excellent opportunity for students to delve into the depths of biology theory, critical thinking, and analysis. By selecting a topic that aligns with their interests and available resources, students can deepen their understanding and appreciation of the biological world. We encourage you to explore these ideas further, as there are endless possibilities awaiting you in the fascinating realm of biology.

4. Criteria for selecting non-experimental IA topics

When choosing a non-experimental IA topic for IB Biology, it is important to consider several criteria to ensure its suitability. By keeping these factors in mind, you can select a topic that aligns with the syllabus and is feasible to carry out.

Relevance to the syllabus:  First and foremost, choose a topic that is directly related to the concepts covered in the IB Biology syllabus. This will ensure that your IA is grounded in the core content of the course and demonstrates your understanding of key biological principles.

Availability of resources:  Consider the availability of resources required for conducting experiments. Non-experimental topics rely on existing data, published studies, or theoretical analysis. Make sure that sufficient and reliable resources are accessible to support your research and analysis.

Feasibility:  It is important to choose a research question that is achievable within the scope of an IA. Given the time constraints and limitations of the IA format, select a topic that can be explored comprehensively without the need for experimental data collection or extensive laboratory work.

Ethical considerations:  Evaluate if your chosen topic adheres to ethical standards. Non-experimental IAs should not involve any harm or experimentation on animals or humans. The focus should be on analyzing existing data or carrying out theoretical investigations.

Potential for personal engagement:  Select a topic that genuinely interests you and allows for personal engagement. Being genuinely interested in your research question will make the process more enjoyable and lead to a more compelling IA.

By considering these criteria, you can select a non-experimental IA topic that not only meets the requirements of the assessment but also allows for meaningful exploration and demonstration of your knowledge and understanding of IB Biology concepts.

Looking for more help with your Internal Assessment? Check out our  IB IA Writing Service  or  buy Internal Assessment .

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Nick Radlinsky is a devoted educator, marketing specialist, and management expert with more than 15 years of experience in the education sector. After obtaining his business degree in 2016, Nick embarked on a quest to achieve his PhD, driven by his commitment to enhancing education for students worldwide. His vast experience, starting in 2008, has established him as a reputable authority in the field.

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