Mastering KCSE Biology with Comprehensive Topical Questions and Answers
K.C.S.E Biology Q & A - MODEL 2008PP1QN10
State the adaptation that enables the red blood cells to move in blood Capillaries
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K.C.S.E Biology Q & A - MODEL 2008PP1QN10
Name the antigens that determine human blood groups
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K.C.S.E Biology Q & A - MODEL 2008PP1QN09
Give three factors that determine the amount of energy a human being require in a day
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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 2008PP1QN07
How does convergent evolution occur
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K.C.S.E Biology Q & A - MODEL 2008PP1QN07
what is fossil
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K.C.S.E Biology Q & A - MODEL 2008PP1QN06
Give two examples of continuous variation in humans
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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 2008PP1QN05
(a) State two factors that affect enzymatic activities
(b) Explain how one of the factors stated in (a) above affects enzymatic Activities
ANSWERS
​(a) Temperature PH co- factors, co- enzymes; enzyme product concentration; substance concentration/ metabolic poison
(b) Temperature- increase in temperature increases rate of enzymatic activity upto an optimum/ low temperature increases enzymatic activity/ too high temp about optimum point denatures enzymes/ enzymatic activity occur at optimum temp. Ph- Enzymes work best at optimum ph/ or extreme for ph denatures enzymes. Enzyme con – Increase in con increase enzymatic activity occur at optimum temperature Co- enzymes – denatures enzymes increasing rate of activity Strate/ enzyme cone- increase in concentration increase enzymatic activity upto certain level. K.C.S.E Biology Q & A - MODEL 2008PP1QN04
The diagrams below show a red blood cell that was subjected to a certain Treatment
(a) Account for shape of the cell at the end of the experiment
(b) Draw a diagram to illustrate how a plant cell would appear if subjected to the same treatment K.C.S.E Biology Q & A - MODEL 2008PP1QN03
State the causative agent of:
(i) Cholera (ii) Candidiasis
ANSWERS
(i) Vibria chlerae
(ii) Canida/ candida albinism
K.C.S.E Biology Q & A - MODEL 2008PP1QN03
Name a disease of the liver whose symptom is jaundice
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K.C.S.E Biology Q & A - MODEL 2008PP1QN02
State the importance of the following processes that take place in the nephrons of a human kidney
(a) Ultra filtration (b) Selective reabsorption
ANSWERS
(a) To remove toxic/ harmful substances/ urea nitrogenous waste from the blood streams
(b) To return useful substances/ glucose and Amino acids loose into the Bloodstream. 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
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K.C.S.E Biology Q & A - MODEL 2007PP2QN07
Describe the structure and functions of the various parts of the human ear
answers
The ear is an organ involved in perceiving sound and maintaining body balance and posture. It is made of the following sections
Pinna – That is funnel shaped structure made of skin and cartilage. It receives sound waves and directs them to the ear tube. External/auditory meatus – That is a canal lined with air and wax. It allows passage of sound waves to the middle ear. The hairs and wax trap dust particles that enter the ear. Tympanic membrane – That is a thin flexible sheet-like structure receives sound waves and pass the vibration to the ossicles. Middle ear that is composed of Tiny bones known as ossicles – They are anvil and incus. They amplify vibration from the tympanic membrane. Eustachian tube – That connects the ear to the nasal cavity. It balances pressure on both sides of the tympanic membrane. Oral window – That is a thin flexible membrane that opens into the inner ear. it receives vibrations from the ossicles and passes them to the inner ear. Inner ear that is compost of; Vestibular apparatus- That are the semicircular canals, utricles and saccules. They help in maintenance of body balance and posture. Cochlea – That is a coiled structure that has sensory cells for hearing. It connected to the auditory nerve that is involved in transmission of sounds to the brain
K.C.S.E Biology Q & A - MODEL 2007PP2QN06
Other than sugars name two compounds that are translocated in phloem
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K.C.S.E Biology Q & A - MODEL 2007PP2QN06
Name the structures in phloem that are involved in the translocation of sugars
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K.C.S.E Biology Q & A - MODEL 2007PP2QN06
In the experiment to determine the effect of ringing on the concentration of sugar in phloem a ring of bark from the stem of a tree was cut and removed. The amount of sugar in grammes per 16cm3 piece of bark above the ring was measured over a 24 hour period. Sugar was also measured in the bark of a similar stem of a tree which was not ringed. The results are shown in the table below.
(a) Using the same axes, plot a graph of the amount of sugar against time
(b) At what time was the amount of sugar highest in the (i) Ringed stem (ii) Normal stem? (c) How much sugar would be in the ringed stem if it was measured at 0345hours? (d) Give reasons why there was sugar in the stems of both trees at 06 45 hours (e) Account for the shape of the graph for the tree with ringed stem between: (i) 06 45 hours and 15 45 hours (ii) 15 45 hours and 00 45 hours
answers
(b)(i) 15: 45
(ii) 12:45 (c) 0.79 + 0.02 grammes (d) The food that had been manufactured the previous day had been converted to soluble sugars and was being translocated to other parts of the plant. (e)0645 hours and 15 45 hours There was low concentration of sugars early in the morning as there was little translocation As day progresses the light intensity increases and more food is manufacture thus more translocation increasing concentration of sugars (ii)15 45 hours and 0045 hours The light intensity is decreasing reducing rate of photosynthesis. Less food is manufactured hence less is translocation As it turns dark there is no photosynthesis reducing concentration of sugars translocated.
K.C.S.E Biology Q & A - MODEL 2007PP2QN05
What is meant by hybrid vigour?
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K.C.S.E Biology Q & A - MODEL 2007PP2QN05
What is genetic engineering?
answer
K.C.S.E Biology Q & A - MODEL 2007PP2QN05
In maize the gene for purple colour is dominant to the gene for white colour. A pure breeding maize plant with purple grains was crossed with a heterozygous plant.
(a) (i) Using letter G to represent the gene for purple colour, work out the genotype ratio of the offspring (ii) State the phenotype of the offspring
K.C.S.E Biology Q & A - MODEL 2007PP2QN04
State two advantages of having an exoskeleton
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K.C.S.E Biology Q & A - MODEL 2007PP2QN04.
State the functions of synovial fluid
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K.C.S.E Biology Q & A - MODEL 2007PP2QN04
State the difference between ball and socket and hinge joint
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