Mastering KCSE Biology with Comprehensive Topical Questions and Answers
K.C.S.E Biology Q & A - MODEL 2014PP1QN23
Below is an illustration of a cross section of a plant root showing the transportation of substances in the plant.
​(a) Name the substances transported along the paths labelled K and L.
K L (b) Give a reason for your answer in L above.
ANSWERS
​(a) K - Photosynthetic products/manufactured foods example vitamins/alicose/proteins/sucrose/maltose/fructose/lipids/nitrates;
L - Water and mineral salts; (b) The substances are moved into the star shaped xylem;
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K.C.S.E Biology Q & A - MODEL 2014PP1QN22
Why are some bacteria able to resist the effect of antibiotics?
ANSWER
K.C.S.E Biology Q & A - MODEL 2014PP1QN22
Name two vestigial structures in human beings.
ANSWERS
K.C.S.E Biology Q & A - MODEL 2014PP1QN21
Name the type of skeleton that makes tip each of the following animals:
(a) locust (b) bird.
ANSWERS
​(a) Exoskeleton;
(b) Endoskeleton; K.C.S.E Biology Q & A - MODEL 2014PP1QN20
State one function of each of the following cell organelles:
(a) golgi bodies (b) lysosomes.
ANSWERS
​(a) Packaging of substances/glycoproteins/ transportation of glycoproteins;
Secretion of synthesized proteins and carbohydrates; Formation of lysosomes/modification of carbohydrates to form glycoproteins; (1 mark) (b) Digestion of food/Breakdown large molecules; Destroy worn out organdies or cells/tissue;
K.C.S.E Biology Q & A - MODEL 2014PP1QN19
Why is a burning charcoal stove in a poorly ventilated room likely to cause death of the inhabitants?
ANSWERS
K.C.S.E Biology Q & A - MODEL 2014PP1QN18
Explain why four months after fertilisation, ovaries can be removed from a human female, without terminating pregnancy.
ANSWERS
K.C.S.E Biology Q & A - MODEL 2014PP1QN18
Explain why mammalian testes are located to hang outside the body
ANSWERS
K.C.S.E Biology Q & A - MODEL 2014PP1QN17
Give a reason why the image is not formed when light is focused on the blind spot.
ANSWER
K.C.S.E Biology Q & A - MODEL 2014PP1QN16
The diagram below illustrates a nerve cell.
​(a) Name the type of nerve cell illustrated.
(b) Give a reason for your answer in (a) above (c) identify the part labelled J (d) State one function of each of the parts labelled G and H. (i) G (ii) H
ANSWERS
(a) Sensory neurone;
(b) Cell body is located off the axon/tied outside the CNS; (c) Schwann cell; (d) (i) Receipt/transmits impulses to neighbouring neurons in the CNS from sense organs; (ii) Insulates the axon/accept dendron for axon;
K.C.S.E Biology Q & A - MODEL 2014PP1QN15
Distinguish between a tendon and a ligament.
ANSWERS
K.C.S.E Biology Q & A - MODEL 2014PP1QN15
Which type of mammalian muscles is voluntary’?
ANSWER
K.C.S.E Biology Q & A - MODEL 2014PP1QN14
State three structural differences between DNA and RNAK.C.S.E Biology Q & A - MODEL 2014PP1QN13
State one function of each of the following parts of a mammalian eye:
(a) eye lashes (b) lachrymal glands.
ANSWERS
​(a) Trap foreign particles entering the eye;
Produce fluid/tears; (b) Moistens the cornea; Wash foreign materials out of the eye; Antiseptic / kills harmful microorganisms; K.C.S.E Biology Q & A - MODEL 2014PP1QN12
The diagram below represents a model used to demonstrate breathing in mammals.
​(a) Name the mammalian structure represented by the parts labelled D and E.
(i) D . (ii) E (b) State the observation made when the string is pulled downwards. (c) Explain the observation in (b) above.
ANSWERS
​(a) (i) Rib-cage/chest cavity;
(ii) Diaphragm; (b) The balloons are inflated; (c) Pulling down the string increases the volume of D, hence decreasing the pressure inside: The low pressure causes external atmospheric air to rush in and inflate the balloons; K.C.S.E Biology Q & A - MODEL 2014PP1QN11
State three differences between tactic and tropic responses.
K.C.S.E Biology Q & A - MODEL 2014PP1QN10
What is meant by each of the following terms?
(i) Crenated cell. (ii) Flaccid cell.
ANSWERS
​(i) Crenated cell is a shrunk animal cell that has lost water by osmosis;
(ii) Flaccid cell is a flabby /shrunk plant cell that has lost waster by osmosis;
K.C.S.E Biology Q & A - MODEL 2014PP1QN10
Explain two roles of diffusion in human beings.
ANSWERS
K.C.S.E Biology Q & A - MODEL 2014PP1QN09
State two functions of intervertebral discs in the mammalian skeleton.
ANSWERS
K.C.S.E Biology Q & A - MODEL 2014PP1QN08
Differentiate between phenotype and genotype as used in genetics.
ANSWERS
K.C.S.E Biology Q & A - MODEL 2014PP1QN07
A student drew a 6cm long diagram of a plant flower. If the actual length of the flower was 12cm, calculate the magnification of the drawing made by the student. Show your working.
K.C.S.E Biology Q & A - MODEL 2014PP1QN06
State three roles of auxins in a plant stem.
ANSWERS
K.C.S.E Biology Q & A - MODEL 2014PP1QN05
The diagram below shows a set up for an experiment to demonstrate a certain physiological process.
​(a) What nature of solution is represented by 20% sugar solution?
(b) Explain the observation made on the set up after one hour.
ANSWERS
K.C.S.E Biology Q & A - MODEL 2014PP1QN04
The diagram below illustrates a growing pollen tube.
​(a) Name the part labelled B.
(b) Explain the role of the parts labelled A.
ANSWERS
(a) Tube nucleus;
(b) One male nucleus fuses with the egg cell nucleus to form a zygote; The other male nucleus fuses with the polar nuclei to form the endosperm;
K.C.S.E Biology Q & A - MODEL 2014PP1QN03
State two functions of the placenta in mammals.
ANSWERS
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