Mastering KCSE Biology with Comprehensive Topical Questions and Answers
K.C.S.E Biology Q & A - MODEL 2013PP1QN14
Name the three end products of anaerobic respiration in plants.
answers
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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.
answer
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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K.C.S.E Biology Q & A - MODEL 2012PP1QN30
Name the organelle that is involved in each of the following:
(a) manufacture of lipids (b) formation of lysosomes
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K.C.S.E Biology Q & A - MODEL 2012PP1QN29
Name two nutrients that are absorbed without being digested by enzymes in humans.
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K.C.S.E Biology Q & A - MODEL 2012PP1QN28
State two differences between open and closed circulatory systems.
answers
Open Closed
Blood flows in haemocoel Blood confined in vessels; sinuses/body cavity directly in contact with cells Blood flows at low pressure Blood flows at high pressure; Blood lack pigments Blood has pigments for oxygen and Carbon (IV) Oxide transportation
K.C.S.E Biology Q & A - MODEL 2012PP1QN27
What is the function of contractile vacuoles in amoeba?
answers
K.C.S.E Biology Q & A - MODEL 2012PP1QN26
(a) State the theories of evolution proposed by the following scientists.
(i) cell organelles (ii) fossils
answers
​(a) Theory of natural selection;
Theory of environmental influence on inherited characteristics; (b) (i) Similar organelles performing similar functions in different organisms suggest a common ancestry/cell biology; (ii) Fossil records/palaeontology/by comparing fossils to show phyllogenetic relationship between organisms/common ancestry; K.C.S.E Biology Q & A - MODEL 2012PP1QN25
State the role of the following hormones in the life cycle of insects:
ecdysone hormone; . juvenile hormone.
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K.C.S.E Biology Q & A - MODEL 2012PP1QN24
State four characteristics of apical meristem cells.
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K.C.S.E Biology Q & A - MODEL 2012PP1QN23
Name the strengthening materials found in the following support tissues:
(a) collenchyrna; (b)Xylem
answers
​(a) Cellulose;
(b) Lignin; |
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