Mastering KCSE Biology with Comprehensive Topical Questions and Answers
K.C.S.E Biology Q & A - MODEL 2011PP1QN09
The diagrams below illustrate the organs of some flowering plants.
​State the classes of plants to which each belong.
A B
answers
​(a) Dicotyledonae;
(b) Monocotyledonae;
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K.C.S.E Biology Q & A - MODEL 2011PP1QN08
State three characteristics of the class crustacea.
answers
K.C.S.E Biology Q & A - MODEL 2011PP1QN07
The diagrams below show an experimental set-up to investigate a certain process in a plant tissue.
Explain the results obtained after 30 minutes.
answers
K.C.S.E Biology Q & A - MODEL 2011PP1QN06
What is meant by the following terms?
(a) Ecology. (b) Carrying capacity.
answers
​(a) This is the study of the inter-relationship between organisms and their environment;
(b) The maximum population of a species than a particular habitat can support; without depletion of resources. K.C.S.E Biology Q & A - MODEL 2011PP1QN05
The figure below illustrates a food web in a certain ecosystem.
From the food web:
(a) draw the shortest food chain; (b) identify the organisms with the highest (i) number of predators; (ii) biomass.
answers
(a) Grass > Grasshopper >- Lizards;
(b) (i) Chicken; (ii) Grass; K.C.S.E Biology Q & A - MODEL 2011PP1QN04
State one use for each of the following apparatus in the study of living organisms.
(a) Pooter (b) Pitfall trap
answers
(a) Sucking small insects/animals;
(b) A trap into which small animals fall and get trapped;
K.C.S.E Biology Q & A - MODEL 2011PP1QN03
Give three reasons for classifying organisms.
answers
​(i) Identify similarities and differences between organisms;
(ii) Organize scientific knowledge in an orderly system; (iii) Monitor emergence, presence and disappearance of organisms in and from the earth; (iv) Grouping organisms for easy stud
K.C.S.E Biology Q & A - MODEL 2011PP1QN02
Name two dental diseases.
answers
K.C.S.E Biology Q & A - MODEL 2011PP1QN01
Name two kidney diseases.
answers
​(i) Nephritis;
(ii) kidney stones; K.C.S.E Biology Q & A - MODEL 2010PP2QN04
The diagram below shows how the iris and pupil of a human eye appear under different conditions..
(a) Name the structures labelled X and Y.
X Y (b) (i) State the condition that leads to the change in appearance shown in the diagram labelled B. (ii) Describe the changes that lead to the appearance of the iris and pupil as shown in the diagram labelled B. (iii) What is the significance of the changes described in (b) (ii) above?
ANSWERS
(a) X Pupil;
Y Circular muscles; (b) (i) Dull/dim light/low light intensity; (ii) Circular muscles (in iris) relax; while radial muscles contract; the pupil becomes bigger; allowing more light to enter the eye; (iii) Allows one to visualize objects/see under dim light;
K.C.S.E Biology Q & A - MODEL 2010PP1QN30
What is meant by the term apical dominance?
answer
K.C.S.E Biology Q & A - MODEL 2010PP1QN29
The diagram below represents a female cone.
​(a) Name the subdivision of the plant from which the cone was obtained.
(b) Other than the presence of cones, name two other external features that identify plants in the subdivision named in (a) above.
answer
(a) Gymnospermae;
(b) Needle-like leaves (with waxy cuticle); Naked seeds;
K.C.S.E Biology Q & A - MODEL 2010PP1QN28
State three structural differences between arteries and veins.
answers
K.C.S.E Biology Q & A - MODEL 2010PP1QN27
Give an example of a genetic disorder caused by:
(i) non-disjunction; (ii) gene mutation.
answers
(i) Down’s syndrome/Turner’s syndrome/Klinefelter’s syndrome;
(ii) Albinism/single cell anaemia/haemophilia/colour blindness;
K.C.S.E Biology Q & A - MODEL 2010PP1QN27
What is meant by the term non-disjunction?
answer
K.C.S.E Biology Q & A - MODEL 2010PP1QN26
State one survival value for each of the following in plants:
(a) Thigmotropism in stems; (b) Geotropism in roots.
answers
(a) Provides support;
Enables plants to grow towards light; Any one (b) In search of nutrients Anchorage;
K.C.S.E Biology Q & A - MODEL 2010PP1QN25
State three factors that contribute to the deceleration phase in the population curve of an organism.
answers
K.C.S.E Biology Q & A - MODEL 2010PP1QN24
Why is Lamark’s theory not acceptable?
answer
K.C.S.E Biology Q & A - MODEL 2010PP1QN24
State two ideas proposed by Lamark in his theory of evolution.
answers
K.C.S.E Biology Q & A - MODEL 2010PP1QN23
Explain three ways in which red blood cells are adapted to their function.
answers
K.C.S.E Biology Q & A - MODEL 2010PP1QN22
What is the function of the following structures in the human reproductive organs?
(a) Fallopian tubes. (b) Epididymis. (c) Scrotal sac.
answers
(a) Passage of ova;
(b) Storage of sperms; (c) Hold the testis; K.C.S.E Biology Q & A - MODEL 2010PP1QN21
The diagram below represents part of the human skeleton.
(a) Name the part labelled P.
(b) (i) Name the bone that articulates with the part labelled Q. (ii) What type of joint is formed between the part labelled Q and the bone named in (b)(i) above? .
answers
(a) P sutures;
(b) (i) Atlas; (ii) Hinge joint;
K.C.S.E Biology Q & A - MODEL 2010PP1QN20
State two advantages of internal fertilization in humans.
answers
K.C.S.E Biology Q & A - MODEL 2010PP1QN19
State the changes that occur in arterioles in the human skin during thermoregulation.
answers
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