Mastering KCSE Biology with Comprehensive Topical Questions and Answers
K.C.S.E Biology Q & A - MODEL 2010PP2QN01
In an experiment, disinfected soaked bean seeds were put in a vacuum flask which was then fitted with a thermometer as shown in the diagram below.
The temperature readings were taken every morning for three consecutive days.
(a) Which process was being investigated? (b) (i) What were the expected results? (ii) Account for the answer in (b)(i) above, (c) Why were the seeds disinfected? (d) Why was a vacuum flask used in the set-up? (e) How would a control for this experiment be set?
answers
(a) Respiration;
(b) (i) Increase/rise in thermometer reading/temperature; (ii) Carbohydrates/starch/glucose in germinating seeds is broken down/oxidised to get energy; some of the energy is released as heat; (which increases temperature reading). (c) To kill bacteria/fungi/microorganisms; that would cause decay/decomposition/respiration of the beans; (d) To conserve heat/prevent heat loss to surroundings; (e) Use similar set-up but with dead and disinfected beans seeds/ use dead disinfected bean seeds/use dry bean seeds;
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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
K.C.S.E Biology Q & A - MODEL 2010PP1QN18
Give two reasons why animals have specialised organs for excretion as compared to plants.
answers
K.C.S.E Biology Q & A - MODEL 2010PP1QN17
The following is the dental formula of a certain mammal:
(a) State the likely mode of feeding for the mammal.
(b) Give a reason for your answer in (a) above.
answers
(a) Herbivorous;
(b) Lack canines on upper Jaw/lack incisors on upper jaws;
K.C.S.E Biology Q & A - MODEL 2010PP1QN16
What is the role of bile salts in digestion in humans?
answers
K.C.S.E Biology Q & A - MODEL 2010PP1QN15
A potted plant was kept in the dark for 48 hours, Two leaves X and Y were treated as shown in the diagram below.
The experimental set-up was kept in sunlight for 6 hours after which a starch test was carried out on the two leaves. .
(a) What were the results of the starch test on leaves X and Y’? X Y (b) Give reasons for your answers in (a) above.
answers
a) X — Starch present;
Y-Starch absent; b) X - Acts as a control; Y - CO2 absent absorbed by potassium hydroxide pellets; Explain why it is not advisable to be in a poorly ventilated room with a burning charcoal stove.24/6/2020
K.C.S.E Biology Q & A - MODEL 2010PP1QN14
Explain why it is not advisable to be in a poorly ventilated room with a burning charcoal stove.
answer
K.C.S.E Biology Q & A - MODEL 2010PP1QN13
What is meant by the following terms?
(a) Habitat; (b) Ecosystem.
answers
(a) Place or environment in which specified organisms live;
(b) A natural unit with abiotic and biotic factors; K.C.S.E Biology Q & A - MODEL 2010PP1QN12
The diagram below illustrates the structure of bread mould.
(a) Name the part labelled J.
J K (b) State the functions of the structure labelled K.
answers
(a) J – sporangium
K-Rhizoids (b)- Absorption of soluble substances/ digested food - Secretion of digestive enzymes; - Anchorage(of mould on substrate); K.C.S.E Biology Q & A - MODEL 2010PP1QN11
The diagram below shows a transverse section of a leaf.
(a) Name the habitat of the plant from which the leaf was obtained.
(b) Give two reasons for your answer in (a) above.
answers
(a) Aquatic;
(b) Large air space/aerenchyma to enhance transpiration; Sclereids for mechanical support of leaf; Stomata on upper epidermis to enhance transpiration:
K.C.S.E Biology Q & A - MODEL 2010PP1QN10
State two advantages of hybrid vigour.
answers
K.C.S.E Biology Q & A - MODEL 2010PP1QN09
State two ways in which chloroplasts are adapted to their function.
answers
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