Mastering KCSE Biology with Comprehensive Topical Questions and Answers
K.C.S.E Biology Q & A - MODEL 1998PP1QN06
In an experiment it was found that when maggots are exposed to light they move to dark areas.
(a) Name the type of response exhibited by the maggots (b) Name the advantages of the response to the maggots
ANSWERS
​(a) Phototais
(b) To avoid desiccation/ drying/ dehydration Escape from predators;
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K.C.S.E Biology Q & A - MODEL 1997PP1QN16
In a breeding experiment, plants with red flowers were crossed. The produced 123 plants with red flowers and 41 with white flowers
(a) Identify the recessive character Give a reason (b) What was the genotype of the parent plants that gave rise to the plants with a red and white flowers?
answers
​(a) White
Give a reason – Fewer numbers/ lower ratio; lower in numbers/ absence of white in parents & absence in offspring. (b) Heterozygous (c) Double recessive / homozygous (recessive)
K.C.S.E Biology Q & A - MODEL 1997PP1QN09.
State three pieces of evidence that support the theory of evolution
ANSWERS
K.C.S.E Biology Q & A - MODEL 1997PP1QN07
State three structural differences between biceps muscles of the gut.
K.C.S.E Biology Q & A - MODEL 1997PP1QN05
In an accident a victim suffered brain injury. Consequently he had loss of memory. Which part of the brain was damaged?
ANSWERS
K.C.S.E Biology Q & A - MODEL 1996PP1QN 18
​In an experiment black mice were crossed and the offspring were back and brown. The gene for black colour is dominant over that of brown colour.
Using letter B to represent the gene for black colour and b to represent the gene for brown colour (a) Work out the genotypes of the F1 generation (b) What is the phenotype ration of the spring K.C.S.E Biology Q & A - MODEL 1996PP1QN 16
​A shoot of seedling exposed to light on one side bends towards the source of light as it grows
(a) Name the response exhibited by the shoot of the seedling (b) Explain how the bending towards the source of light occurs
answers
​(a) Phototropism
(b) Auxins / hormones; move diffuse to the demised/ away from the light side; causing elongation/ growth on the dark sides hence bending ​Give a reason why it is only mutation in genes of gametes that can influence evolution.
ANSWERS
Gametes form new offspringState the function of Deoxyribonucleic acid (DNA) molecule.KNEC ANSWER
Controls/regulates/enzymes/ synthesis is the material for inheritance​KCSE PAST PAPERS: BIOLOGY FORM 3 TOPICAL QUESTIONS AND ANSWERSQUESTIONS![]()
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​KCSE TOPICAL QUESTIONS AND ANSWERS: BIOLOGY FORM 4QUESTIONS![]()
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