Mastering KCSE Biology with Comprehensive Topical Questions and Answers
K.C.S.E Biology Q & A - MODEL 2013PP1QN21
Explain the role of continental drift in evolution.
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K.C.S.E Biology Q & A - MODEL 2013PP1QN20
Explain the theory of evolution by natural selection.
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K.C.S.E Biology Q & A - MODEL 2013PP1QN19
State three factors in seeds that cause dormancy.
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K.C.S.E Biology Q & A - MODEL 2013PP1QN18
How is the human sperm cell structurally specialised?
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K.C.S.E Biology Q & A - MODEL 2013PP1QN17
Name the flower part that produces gametes.
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K.C.S.E Biology Q & A - MODEL 2013PP1QN16
Name three mechanisms that ensure cross pollination takes place in flowering plants.
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K.C.S.E Biology Q & A - MODEL 2013PP1QN15
State two reasons why accumulation of lactic acid leads to an increase in heart beat.
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K.C.S.E Biology Q & A - MODEL 2013PP1QN14
Name the three end products of anaerobic respiration in plants.
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K.C.S.E Biology Q & A - MODEL 2013PP1QN13
State two characteristics of living organisms that are specific to plants.
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K.C.S.E Biology Q & A - MODEL 2013PP1QN12
​(a) A student collected an organism and observed the following features: simple eyes,four pairs of legs and two body parts.
(i) State the class to which the organism belongs. (ii) Give an example of an organism in this class. (b) Name the kingdom to which plasmodium belongs.
answers
​(a) (i) Arachnida;
(ii) Spider/scorpion/tick/mite; (b) Protoctista/protista;
K.C.S.E Biology Q & A - MODEL 2013PP1QN11
State the advantage of possessing blood group AB.
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K.C.S.E Biology Q & A - MODEL 2013PP1QN10
How are lenticels adapted for gaseous exchange?
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K.C.S.E Biology Q & A - MODEL 2013PP1QN09
State one way in which each of the following is structurally adapted to its function:
(a) neurone; (b) mitochondrion.
answers
a)Presence of myelin sheath for insulationlincreases transmission; Axon for transmission of impulses;
Large cell body controls activites of cell; Nerve endings/dendrites receives impulses from receptors cells; Node of Ranvier speeds up impulse transmission. (b) Inner membrane highly folded/cristae to increase S A for attachment of (respiratory) enzymes.
K.C.S.E Biology Q & A - MODEL 2013PP1QN08
Construct a step in a dichotomous key using two leaves one with a serrated and the other with a smooth margin.
answers
​1(a) - Leaf with serrated margin -- go to 2;
(b) - Leaf with smooth margin -- go to --; K.C.S.E Biology Q & A - MODEL 2013PP1QN07
Explain how the following forces contribute to the movement of water up the xylem vessels:
(a) cohesion; (b) adhesion.
answers
(a) Water molecules cling to each other maintaining a continuous column of water/preventing the break of water column;
(b) Water molecules cling to the sides of the xylem vessel walls;
K.C.S.E Biology Q & A - MODEL 2013PP1QN06
Using a microscope, a student counted 55 cells a cross a field of view whose diameter was 6000pm. Calculate the average length of the cells. Show your working.
answers
​ 6000(um)/55 (cells)=; 109um;
K.C.S.E Biology Q & A - MODEL 2013PP1QN05
Describe how turgor pressure builds up.
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K.C.S.E Biology Q & A - MODEL 2013PP1QN04
Explain how age determines a person’s energy requirements.
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K.C.S.E Biology Q & A - MODEL 2013PP1QN04
State two roles of mucus in the stomach.
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K.C.S.E Biology Q & A - MODEL 2013PP1QN03
Name the taxonomic unit that comes immediately after a phylum in classification.
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K.C.S.E Biology Q & A - MODEL 2013PP1QN03
State two external features found in the class Mammalia only.
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K.C.S.E Biology Q & A - MODEL 2013PP1QN02
The diagram below represents a cell as seen under an electron microscope.
​(a) Based on the diagram, state whether it represents an animal cell or a plant cell.
(b) Give two reasons for your answer in 2(a) above. (c) Why is the palisade layer a tissue?
answers
​(a) Animal cell;
(b) Has cell membrane only/has no cell wall; Has numerous small vacuoles; Has central nucleus; (c) Consists of many similar cells performing the same function;
K.C.S.E Biology Q & A - MODEL 2013PP1QN01
Explain how an increase in temperature affects the rate of active transport.
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K.C.S.E Biology Q & A - MODEL 2013PP1QN01
What is meant by the term wilting?
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Describe how environmental factors increase the rate of transpiration in terrestrial plants.26/6/2020
K.C.S.E Biology Q & A - MODEL 2012PP2QN08
Describe how environmental factors increase the rate of transpiration in terrestrial plants.
ANSWERS
In bright light; stomata are fully/wide open; increasing contact between the atmosphere and air spaces in the leaf; This in turn increases water loss by evaporation through the
open stomata High environmental temperatures; increase the rate of evaporation from the leaf surface thus more water leaves cells due to the increased diffusion gradient; Iii a windy day; air around the leaf is carried away reducing water vapour around the leaf; more water moves into the atmosphere from the leaf air spaces; In low humidity/when the atmosphere is less saturated with water vapour; more water will move from leaf air spaces into the atmosphere; leading to increased rate of transpiration; . Low atmosphere pressure; increases diffusion gradient between atmospheric and leaf increased rate of evaporation;Availability of water; causes turgidity of guard cells hence stomata open; increasing rate of transpiration. |
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