kcse biology essays pdf download

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Biology essays questions with answers

This document contains over 60 Biology essays questions with answers..It is suitable for both students and teachers.It is well analysed and prepared with the aim of preparing KCSE candidates for biology exam.

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KCSE 2018 Biology Paper 1 with Marking Scheme

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Next Topic » KCSE 2018 Biology Paper 2 with Marking Scheme

• Name the cell organelle found in abundance in the white blood cells.(1 mark)
• Give a reason for your answer in (a) above.(1 mark)
• State two observable features that place a millipede into its Class.(2 marks)
• Which sets of teeth would be used in chewing sugarcane for maximum extraction of sap?(2 marks)
• What biological process were they investigating?(1 mark)
• Name the structures from which the air bubbles were coming from.(1 mark)
• Explain the distribution of the structures named in (b) above on the leaf surfaces of a land plant.(2 marks)
• State why it is important for plants to lose water to the atmosphere.(3 marks)

• Name fluid G.(1 mark)
• Give two ways by which fluid G is different from tissue fluid.(2 marks)
• Define respiration(1 mark)
• State three activities in the human digestive system that depend on respiration.(3 marks)
• State three ways in which blood capillaries are structurally adapted to their functions(3 marks)

• Name the organ.(1 mark)
• Describe how air in water reach the capillaries inside structure L.(3 marks)
• Name two products of respiration in plants.(2 marks)
• State one homeostatic role of the human skin.(1 mark)
• Name three structures of the skin essential for its homeostatic function.(3 marks)
• Explain why the nephron is long and convoluted.(3 marks)
• State two limitations of us.ng a quadrat to estimate the population of organisms.(2 marks)

• Name the type of germination illustrated in the diagram.(1 mark)
• Describe how the type of germination named in (a) abave is brought about.(3 marks)
• Explain why a bony fish dies shortly after being removed from water.(4 marks)
• Name the bones that articulate to form a ball and socket joint at the hip.(2 marks)
• Explain the role of carbonic anhydrase in red blood cells.(3 marks)
• List two features which the lady has that are due to inheritance.(2 marks)
• Explain why most recessive genes arc cxpressed prenotypically in male offspring of humans.(3 marks)

• Which diagram represents the beak from which the others are likely to have evolved?(1 mark)
• Explain your answer in (a) above.(3 marks)
• Define the term analogous structures.(1 mark)
• Give two illustrations of analogous structures in mammals.(2 marks)
• State two ways in which plants with weak stems obtain mechanical support(2 marks)
• What does the term evolution mean?(1 mark)

• Explain why a camel has a longer nephron than a whale.(3 marks)

MARKING SCHEME

• Lysosomes/golgi apparatus; 
• White blood cells fight pathogens to protect the body, the lysosomes contain lytic enzymes which destroy pathogens;/golgi apparatus synthesize lysosomes which contain lytic enzymes that destroy parthogens;
• Cylindrical body;
• 9--100 segments;
• Each segment has two pairs of legs;
• Pair of short antennae; 
• Has two clumps of many simple eyes; 
• Has anterior genital pore/apparatus;
• Has three body parts (head, thorax and trunk); Any 2
• Premolars; molars;
• Photosynthesis;/gaseous exchange in plants,
• Stoma/somata; 
• Are more on the lower surface of terrestrial plants/fewer on the upper surface; to reduce transpiration;
• Cools the plant;
• For uptake of water up the xylem vessels;
• Mechanism through which mineral elements are transported in the plant; 
• Removal excess water;
• Maintains turgor pressure;
• (Blood) plasma;(1 mark)
• Has (more large) proteins/blood platelets; High (hydrostatic) pressure/low pressure of tissue fluid; Has red blood cells;
• Process by which living organisms/cells break down loxidize (organic) food materials into simpler compounds to release energy:
• -Peristalsis; -Absorption of materials; -Chewing (movement of jaw muscles); -Churning; -Secretion of digestive enzymes Any 3       (3 marks)
• Numerous to increase surface area through which materials diffuse;
• Thin/one-cell thick/single cell epithelium'endothelium for faster diffusion;
• • Lined with a single cell epithelium for faster diffusion; 
• Are selectively permeable for passage of materials, 
• Narrow lumen to maintain preesure; Any 3
• Fish mouth opens lowering pressure in buccal cavity and water rushes in; mouth closes increasing pressure that forces water into the gill cavity/opercular cavity; O2 rich water flows over the gills in a counter current direction to capillary blood flow, causing O2 to diffuse into the gill capillaries; Any 3 
• Carbon (IV)oxide;
• Energy/Adenosine Triphosphate; 
• Alcohol/ethanol/ethyl alcohol; Any 2 
• Thermoregulation; Osmoregulation; Regulating salt balance; Any 1
• - Blood vessels/arterioles; - Hair, - Sweat glands; - Erector pili muscles; - Nerve endings Any 3
• To fit in the limited space) in the kidney/occupy less space;
• Increase surface area for selective) reabsorption;
• Allow for more time for (selective) reabsorption;
• Cannot be used for most animals/plants;
• Assumes organisms are evenly distributed;
• Inaccuracy (over/under-estimation); Any 2 
• Hypocotyl elongates faster than the epicotyl; pushing cotyledons above the ground; 
• Fish uses dissolved oxygen for gaseous exchange: gill filament epithelium dries up; gill filaments clamp together; surface area for gaseous exchange reduced; oxygen lacks moist surface for dissolution causing death(due to suffocation);
• Femur; Pelvic girdle;
• Converts carbon (IV) oxide to carbonic acid; which easily dissociates into hydrogen ions (H + and hydrogen carbonates (HCO 3 - for easier transportation; reducing acidity in blood;
• Height (tallness); Long hair; Skin colour (light); Any 2
• Most of the genes are sex-linked and are carried on the X chromosomes: boys receive X chromosomes from the mother (and Y chromosomes from the father); if the X carries a recessive gene, it is more likely to be phenotypically expressed in boys; 
• Beak M is simple/basic; original beak; the birds separated to occupy different niches, and specialized for different diets; leading to more complex/developed beaks over time; Any 3
• Different embryonic origin but evolved to perform similar functions due to exploitation of same kind of environment);
• -Wings of bats and insects; -Eyes of mammals and molluscs; -Limbs of mammals and arthropods; -Flipper in whales/dolphins and fins of fish; 
• Twinning around a support:
• Use of tendrils/spines/thorns/hooks (to cling on nearby plants/trees); 
• Turgid cells in their stems); Any 2
• Gradual change from simple life forms to complex forms over a (long) period of time; 
• Growth; and development; 
• Reproduction: C
• A camel is a desert animal, a longer nephron increases the surface area for reabsorption of water, to conserve it; a whale is aquatic animal, (does not need to conserve water);
• Aestivation;
• Reduced metabolic activity; hence low rate of respiration; minimizing water loss/ dessication (to the environment); 
• Less-toxic;
• Very soluble;
• A small molecule (easily filtered in the kidneys);
• Requires less water to excrete; Any 2
• Mouse is active/has a large surface area to volume ratio; hence has a higher metabolic rate (rate of breathing) to cope with the rate at which energy (oxygen) is consumed or lost to the environment; an elephant is less active/has a small surface area to volume ratio hence has a lower rate at which energy (oxygen) is used or lost; or Mouse is small in size/has large surface area to volume ratio, hence has a metabolic rate (rate of breathing) to cope with the rate at which oxygen is consumed/energy is lost to the environment, an elephant is large in size/has small surface area to volume ratio; hence has a lower rate at which oxygen/energy is lost;

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BIOLOGY ESSAYS FOR EASY REVISION. 1(a

Describe the digestion of a starchy meal along the human alimentary canal. S (13 mks) Answer-Starch in food is first broken down in the mouth by action of teeth/ chewing; This increases the surface area exposed enzyme action; saliva contains salivary amylase which breaks down some starch to maltose; saliva has a slightly alkaline pH which is optimum for the enzyme; The food moves down to the oespophagus and stomach; where the acidic pH, due presence of dilute Hcl, prevents further action of salivary amylase; In the duodenum, pancreatic amylase continues digestion of starch to maltose; Pancreatic amylase is produced in the pancrease; and enters the duodenum through pancreatic ducts; the acidic chyme is neutralized by the sodium bicarbonate in bile/ pancreatic juice; Maltose digestion continues in the ileum; whose walls secrete succus entericus/ intestinal juice; which contains enzyme maltase; which breaks down maltose to glucose; (Max 13 marks) (b) Describe the process of urea formation. (7marks) answer Excess amino acids / proteins; are transported to the liver 2. (a) Describe how gaseous exchange occurs in terrestrial plants. (13 marks) Answer Gaseous exchange takes place in a spongy mesophyl During the day air diffuses into large air spaces of spongy mesophyll; through stomata; the Carbon (IV) Oxide in the air diffuses into Photosynthetic cells; in solution form; during photosynthesis Carbon (iv) Oxide is used while oxygen is produced. Oxygen diffuses out of the leaf; through stomata; During the night; air diffuses into the air spaces (of spongy mesophyll), the air dissolves into film of moisture; then oxygen diffuses into the cells; and is used in respiration during which carbon (iv) oxide is produced, the Carbon (iv) Oxide diffuses out of the leaf; through stomata; due to concentration/diffusion gradient; Gaseous exchange takes place through epidermis (of young leaves and stems); epidermis of the root carries out gaseous exchange with air in the soil; some plants have pneumatophores/breathing roots; in which gaseous exchange occurs through lenticels; (found in

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KCSE Biology Revision Booklets-Questions and Answers

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• LESSON NOTES
• LESSON PLANS
• 2021 SCHEMES
• POWERPOINT NOTES
• FORM 1 EXAMS
• FORM 2 EXAMS
• FORM 3 EXAMS
• FORM 4 EXAMS
• COMPREHENSIVE 1-4
• TOPICAL QUESTIONS
• K.C.S.E SYLLABUS
• REVISION MOCKS
• K.C.S.E REVISION
• 2018 K.C.S.E PAPERS
• 2017 K.C.S.E PAPERS
• 2016 K.C.S.E PAPERS
• 2015 K.C.S.E PAPERS
• 2014 K.C.S.E PAPERS
• 2013 K.C.S.E PAPERS
• 2012 K.C.S.E PAPERS
• 2011 K.C.S.E PAPERS
• 2010 K.C.S.E PAPERS
• 2008 K.C.S.E PAPERS
• 1996-2009 K.C.S.E PAPERS
• TOPICAL PAST PAPERS
• SECONDARY F1-4
• REVISION NOTES STD 4-8
• SCIENCE NOTES STD 4-8
• SOCIAL STUDIES NOTES STD 4-8
• COMPREHENSIVE NOTES STD 4-8
• SCIENCE POWERPOINT
• SOCIAL STUDIES POWERPOINT
• K.C.P.E TOPICAL REVISION
• BEST & WORST INSHAS
• 2018 K.C.P.E PAST PAPERS
• 2000-2017 K.C.P.E PAPERS
• SCHEMES STD 4-8
• GRADE 1 EXAMS
• GRADE 2 EXAMS
• GRADE 3 EXAMS
• GRADE 1 NOTES & CLASS READERS
• GRADE 2 NOTES & CLASS READERS
• GRADE 3 NOTES & CLASS READERS
• GRADE 1 SCHEMES OF WORK
• GRADE 2 SCHEMES OF WORK
• GRADE 3 SCHEMES OF WORK
• GRADE 1 CURRICULUM
• GRADE 2 CURRICULUM
• GRADE 3 CURRICULUM
• GRADE 1-3 SYLLABUS

KCSE Biology Essay Questions and Answers PDF

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