Mastering KCSE Biology with Comprehensive Topical Questions and 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
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K.C.S.E Biology Q & A - MODEL 1996PP1QN 17c
How can low blood volume be brought back to normal
answers
K.C.S.E Biology Q & A - MODEL 1996PP1QN 17b
Name the process by which the human body naturally stops Bleeding?
answers
K.C.S.E Biology Q & A - MODEL 1996PP1QN 17a
How may excessive bleeding results in death?
answers
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 K.C.S.E Biology Q & A - MODEL 1996PP1QN15
To estimate the population size of crabs in a certain lagoon, traps were laid at random. 400 crabs were caught, marked and released back into the lagoon. Four days later, traps were laid again and crabs were caught. Out of the 374 crabs, 80 were found to be marked.
Where N = Total population of crabs in the lagoon
n = Total number of crabs in the second catch M = Number of marked crabs during the first m= Number of marked crabs in the second catch
K.C.S.E Biology Q & A - MODEL 1996PP1QN14b
Name two structures used for gaseous exchange in plants
answers
Describe the path taken by carbon dioxide released from the tissue of an insect to the atmosphere14/6/2020
K.C.S.E Biology Q & A - MODEL 1996PP1QN14
Describe the path taken by carbon dioxide released from the tissue of an insect to the atmosphere
answers
The diagram below shows a set – up that was used to demonstrate Fermentation Glucose solution was boiled and oil added on top of it. The glucose solution was then allowed to cool before suspension. (a) Why was the glucose solution boiled before adding the yeast Suspension? (b) What was the importance of cooling the glucose solution before adding the yeast suspension? (c) What was the use of oil in the experiment? (d) What observation would be made in test tube B at the end of the experiment? (e) Suggest a control for this experiment answers
K.C.S.E Biology Q & A - MODEL 1996PP1QN12 Give a reason why it is necessary for frogs to lay many eggs
ANSWERS
​To increase the chances of fertilization and survival of species
​Give a reason why it is only mutation in genes of gametes that can influence evolution.
ANSWERS
Gametes form new offspring​A student set up an experiment as shown in the diagrams below;
The set up was at room temperature for a week
ANSWERS
(a) O2 is necessary for germination
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