Mastering KCSE Biology with Comprehensive Topical Questions and Answers
K.C.S.E Biology Q & A - MODEL 2008PP1QN14
Describe the three characteristics of a population
ANSWERS
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K.C.S.E Biology Q & A - MODEL 2008PP1QN08
The diagram below shows a stage in mitosis in a plant cell
(a) Name the stage of mitosis
(b) Give two reasons for your answer in (a) above (c) Name the part of the plant from which the cell used in preparation was Obtained
ANSWERS
(a) Anaphase
(b) Chromatids fails to separate off poles Sister chromatids separate/ pair of chromatid separate (c) Root tip/ shoot/ cambium
K.C.S.E Biology Q & A - MODEL 2008PP1QN06
Give two examples of continuous variation in humans
ANSWERS
K.C.S.E Biology Q & A - MODEL 2008PP1QN06
What is meant by non- disjunction?
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K.C.S.E Biology Q & A - MODEL 2008PP1QN01
Name the tissues in plants responsible for:
(a) Transport of water and mineral salts (b) Transport of carbohydrates (c) Primary growth
ANSWERS
(a) xylem
(b) Phloem (c) Apical meristems
K.C.S.E Biology Q & A - MODEL 2007PP2QN08
Describe causes and methods of controlling water pollution
answers
K.C.S.E Biology Q & A - MODEL 2007PP2QN03
The diagram below shows a stage during fertilization in a plant.
(i) Name the parts labeled Q, R, and S
R S (ii) State two functions of the pollen tube (c) On the diagram label the micropyle K.C.S.E Biology Q & A - MODEL 2007PP2QN03
What is meant by the following terms
(i) Protandry (ii) Self sterility?
answers
(i) Protandry – stamens mature and pollen grains are shed off before the stigma matures
(ii) Self sterility – Pollen grains from the anthers cannot grow on the stigma of the same flower or plant
K.C.S.E Biology Q & A - MODEL 2007PP1QN23
Name the hormone that is responsible for apical dominance
ANSWER
K.C.S.E Biology Q & A - MODEL 2007PP1QN19
Name the part of a bean that elongates to bring about epigeal germination
ANSWER
K.C.S.E Biology Q & A - MODEL 2007PP1QN19
State two environmental conditions that can cause seed dormancy
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K.C.S.E Biology Q & A - MODEL 2007PP1QN18
State two disadvantages of sexual reproduction in animals
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K.C.S.E Biology Q & A - MODEL 2007PP1QN17
The diagram below represents a stage during cell division
(a) (i) Identify the stage of cell division
(ii) Give three reasons for your answer in (a) (i) above (b) Name the structures labeled M
ANSWERS
(a) (i) Anaphase 1
(i) Homologous chromosomes separates at the equator (ii) Chromosomes start migrating to opposite poles (iii) Sister chromatids attached at the centromere (b) Spindle fibres
K.C.S.E Biology Q & A - MODEL 2007PP1QN16
State two ways in which schritosoma species is adapted to parasitic mode of life
ANSWERS
K.C.S.E Biology Q & A - MODEL 2007PP1QN15
Name a method that could be used to estimate the population size of the following organisms
(i) Fish in a pond (ii) Black jack in a garden
ANSWERS
​(i) Capture and recapture method
(ii) Line transect
K.C.S.E Biology Q & A - MODEL 2007PP1QN15
Distinguish between population and community
ANSWERS
K.C.S.E Biology Q & A - MODEL 2007PP1QN14
What is the meaning of the terms
(i) Homeostatic (ii) Osmoregulation?
ANSWERS
K.C.S.E Biology Q & A - MODEL 2006PP2QN06
An experiment was carried out to investigate the effect of hormones on growth of lateral buds of three pea plants
The shoots were treated as follows: Shoot A – Apical bud was removed. Shoot B – Apical bud was removed and gibberellic acid placed on the cut shoot. Shoot C – Apical bud was left intact. The length of the branches developing from lateral buds were determined at regular intervals. The results obtained are as shown in the table below.
a) Using the same axes, draw graphs to show the lengths of branches against time.
b)i) What was the length of the branch in shoot B on the 7th day? ii) What would be the expected length of the branch developing from shoot A on the 11th day? c) Account for the results Obtained in the experiment d) Why was shoot C included in the Experiment? e) What is the importance of gibberellic acid in agriculture? f) State two physiological processes that are brought about by the application of gibberellic acid on plants.
answers
(b) (i) 105 + 1 (mm)
(ii) 134 – 140 (mm) (c) Graph A: The tip of the shoot which was removed contained indole acetic acid (IAA); which causes apical dominance/ inhibits growth/ development of more lateral buds; hence lateral buds sprouted/grew. Graph B; the gibberellic acid which was added on the cut. Promotes formation of lateral branches of stems, hence the fast growth of branches on shoot b. Graph C; The shoot tip which remained intact contains IAA which inhibits growth/ development of lateral buds; hence little change of length of lateral branches. (d) Control (e) Increase productivity (f) Promote cell division, and cell elongation K.C.S.E Biology Q & A - MODEL 2006PP2QN05
The diagram below represents human foetus in a uterus.
a) Name the part labeled S.
b) i) Name the types of blood vessels found in the structure labeled Q. ii) State the differences in composition of blood found in the vessels named in (b)(i) above. c) Name two features that enable the structure labeled P carry out its function. d) State the role of the part labeled R
answers
(a) Chorion
(b) (i) Arteries; veins (ii) More food nutrients; more oxygen in veins less food nutrients more excretory products in arteries (c) Highly vascular zed; large surface area Presence of secretory cells (d) Cushion/ absorb shock Give three reasons for loss of energy from one trophic level to another in the food chain.19/6/2020
K.C.S.E Biology Q & A - MODEL 2006PP2QN03
Give three reasons for loss of energy from one trophic level to another in the food chain.
answers
K.C.S.E Biology Q & A - MODEL 2006PP2QN03
Distinguish between pyramid of numbers and pyramid of biomass.
answers
K.C.S.E Biology Q & A - MODEL 2006PP1QN26
The chart below represents a simplified nitrogen cycle.
​What is represented by X,Y, and Z?
answers
X- Denitrifying bacteria/ denitrification
Y- Animals/ Herbivores; accept primary consumers Z- Nitrogen fixing bacteria ( in soil) accept Azotobacter. A dog weighing 15.2kg requires 216kj while a mouse weighing 50g requires 2736kj per day. Explain.19/6/2020
K.C.S.E Biology Q & A - MODEL 2006PP1QN25
A dog weighing 15.2kg requires 216kj while a mouse weighing 50g requires 2736kj per day. Explain.
answer
K.C.S.E Biology Q & A - MODEL 2006PP1QN19
Give three advantages of cross pollination.
answers
K.C.S.E Biology Q & A - MODEL 2006PP1QN19
a) Explain how the following prevent self pollination.
(i) Protoadry (ii) Self – sterility.
answers
(i) Protoandry – Male reproduction organ/ anthers androecia/ stamens mature earlier than female reproduction organ/ carpels/ stigma/ pistil/ gynoecium.
(ii) Self sterility- pollen grains are sterile to stigma of some plants/ flowers |
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