Mastering KCSE Biology with Comprehensive Topical Questions and Answers
K.C.S.E Biology Q & A - MODEL 1998PP1QN04
Why are gills in fish highly vascularized?
ANSWERS
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K.C.S.E Biology Q & A - MODEL 1998PP1QN01
Why are people with blood group O universal donors?
ANSWERS
K.C.S.E Biology Q & A - MODEL 1997PP1QN15
The equation below represent a metabolic that occurs in the mammalian live Amino acids →Organic compounds + urea
​(a) Name the process.
(b) What is the importance of the process to the mammal? (c) What is the source of amino acids in this process (d) What is the difference between essential and nonessential amino acids?
ANSWERS
​(a) Deamination
(b) Removal of excess amino acids availing energy in the body formation glycogen/ fat for storage. (c) Proteins (d) Essentials amino acids are acquired from food Non- essential are synthesized in the body K.C.S.E Biology Q & A - MODEL 1997PP1QN13
An experiment was carried out to determine the rate of transpiration in three plants A, B and C. Plants, A and B belonged to different species while plants B and C belonged to the same species. Plant C had all its leaves removed. The three plants were of similar size and were exposed to the same environment conditions. The results are as shown below in the graphs below
​(a) Suggest possible environment conditions under which the experiment was carried out between 30 and 60 minutes
(b) Account for the results obtained for plant C (c) Suggest the habitat for plant A and B. Give reasons for your answer. Habitat for plant A Habitat for plant B
ANSWERS
​(a)strong air/ winds
High temperature Low humidity; accept dry conditions/ sunlight (b)Absence of leaves/ stomata absent Transpiration; / little transpiration (c)Arid/dry/ desert/ accept semi- desert Reason Low rate of water loss; accept more/ a lot of water loss Wet/Moist/aquatic Reason High rate of water/ high rate of transpiration /acc. A lot of water loss K.C.S.E Biology Q & A - MODEL 1997PP1QN08
A person was found to pass out large volumes of dilute urine frequently.
Name the (a) Disease the person was suffering from (b) Hormone that was deficient
ANSWERS
​(a) Disease the person was suffering from
Diabetes inspidus ref. Diuresis/ water diabetes (b) Hormone that was deficient Antidiuretic hormone/ ADH/Vasopressin K.C.S.E Biology Q & A - MODEL 1997PP1QN06
​ Oil can be applied on the stagnant water to control the spread of malaria.
(a) How does this practice control the spread of malaria? (b) Give a reason why this practice should be discouraged
ANSWERS
(a) Mosquito larvae/ Pupae are killed; Accept suffocation/ Breaking life cycle of Mosquitoes
(b) Pollution of environment/ oil expensive, other aquatic are killed; accept Contamination.
K.C.S.E Biology Q & A - MODEL 1997PP1QN03
What are the three end products of anaerobic respiration in plants
ANSWERS
K.C.S.E Biology Q & A - MODEL 1996PP1QN 22
Describe how new plants arise by asexual reproduction
ANSWERS
K.C.S.E Biology Q & A - MODEL 1996PP1QN 21
Explain how the mammalian skin is adapted to perform its functions
ANSWERS
​The cornified layer is made up of dead cells, that prevent entry of bacteria and prevent physical damage; melanin protects the body against U-V variation; sebaceous glands produce a chemical/ ring substance which is of blood vessel; which when the body temperature is high dilate and heat is lost or when body temp is low blood vessels constrict.
And heat is retained. Hair when it is called, stands and traps air between themselves; to retain heat/ stop heat loss or when it is hot hair lies flat close on the skin; so does not trap air, and therefore heat is retained and sweat is lost; the skin has sweat glands which produces sweat; sweat evaporates thus cooling the body. K.C.S.E Biology Q & A - MODEL 1996PP1QN 19
​The diagram below represents then pathways of water from the soil into the plant.
(a) Name the structures labeled K and L.
(b) Explain how water from the soil reaches the structure labeled L. (c) Name the process by which mineral salts enter into the plant
ANSWERS
(a) K- Root hair
L- Xylem vessel (b) Water moves from the soil into the root hair by osmosis; because concentration of cell sap is higher than water in the soil; the cell sap in the root hair is diluted, thus making it less concentrated than neighboring cell; therefore water moves into the neighboring cell; it is actively secreted into structure L. (c) Active transport/ diffusion
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
Describe how excretion takes place in |
excretion_and_homeostasis_biology_form_2_kcse_topical_questions_and_answers.pdf | |
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transport_in_plants_and_animals__biology_form_2_kcse_topical_questions_and_answers.pdf | |
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respiration_biology_form_2_kcse_topical_questions_and_answers.pdf | |
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gaseous_exchange_biology_form_2_kcse_topical_questions_and_answers.pdf | |
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ANSWERS [MARKING SCHEMES]
excretion_and_homeostasis_biology_form_2_kcse_topical_questions_and_answers.pdf | |
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transportation_in_plants_and_animals_ans.pdf | |
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gaseous_exchange_marking_scheme.pdf | |
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respiration_marking_scheme.pdf | |
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