Mastering KCSE Biology with Comprehensive Topical Questions and Answers
K.C.S.E Biology Q & A - MODEL 2003PP1QN14
Explain the role of antidiuretic hormone when there is excess water in the human body.
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K.C.S.E Biology Q & A - MODEL 2003PP1QN15
A response exhibited by a certain plant tendril is illustrated below.
​a) i) Name the type of response
ii) Explain how the response named in (a)(i) above occurs b) What is the importance of tactic responses to microscopic plants? c) State four applications of plant hormones in agriculture.
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a) i) Thigmotropism / haptotropism
ii) Contact with support; causes migration of auxine to enter the side; causing faster growth on the side away from centre of surface (causing tendrils curl around support.) b) Escape injurious stimuli / seek favorable habitats; move towards light / stimuli. c) Induce foot growth in stem cutting
K.C.S.E Biology Q & A - MODEL 2003PP1QN14
Explain how marine fish regulate their osmotic pressure.
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K.C.S.E Biology Q & A - MODEL 2003PP1QN13
The diagram below shows gaseous exchange in tissues.
a) Name the gas that diffuses:
i) To the body cells ii) From the body cells b) Which compound dissociates to release the gas named in (a) (i) above? c) i) what is tissue fluid? ii) What is the importance of tissue fluid? d) Name the blood vessel with the highest concentration of: i) Glucose ii) Carbon dioxide
answers
​a) i) Oxygen
ii) Carbon dioxide b) Oxyhaemoglobin c) i) The blood plasma except blood cells and proteins; that has filtered out of the capillaries. ii) It is a medium of exchange of substances/ materials between capillaries and body cells; supply nutrients to cells / supply oxygen to cells / remove waste products from cells. d) i) Hepatic portal vein ii) Pulmonary artery K.C.S.E Biology Q & A - MODEL 2003PP1QN12c
In Drosophila Melanogaster, the inheritance of eye colour is sex – linked. The gene of red eye is dominant. A cross was made between a homozygous red – eyed female and a white – eyed male. Work out the phenotypic ration of F1 generation. (Use R to represent the gene for red eyes).
K.C.S.E Biology Q & A - MODEL 2003PP1QN12b
Name two sex – linked traits in humans.
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K.C.S.E Biology Q & A - MODEL 2003PP1QN12
What is meant by the term sex – linkage?
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K.C.S.E Biology Q & A - MODEL 2003PP1QN10
How are leaves of submerged adapted plants for photosynthesis?
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K.C.S.E Biology Q & A - MODEL 2003PP1QN11.
Name the causative agent of typhoid.
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K.C.S.E Biology Q & A - MODEL 2003PP1QN09
Name the:
a) Material that strengthens xylem tissue. b) Tissue that is removed when the bark of a dicotyledonous plant is ringed.
answers
a) lignin
b) Phloem
K.C.S.E Biology Q & A - MODEL 2003PP1QN08
State a function of the large intestine in humans
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K.C.S.E Biology Q & A - MODEL 2003PP1QN07
The diagram below represents regions of a root tip.
a) Name the tow regions above X in ascending order
b) State the function of the part labeled X
answers
a) Zone of cell division Acc cell multiplication
Zone of cell elongation / enlargement; Acc expansion for elongation b) To protect root tip
K.C.S.E Biology Q & A - MODEL 2003PP1QN06.
Distinguish between analogous and homologous structures.
answers
​Analogous structures – structures which (appear similar and ) perform similar functions but have different origins.
Homologous structures – structures which have a common origin but (have evolved to ) perform different functions. K.C.S.E Biology Q & A - MODEL 2003PP1QN05
A bone obtained from a mammal is represented by the diagram below.
​a) Name the bone.
b) Which bones articulate with the bone shown in the diagram at the notch?
answers
a) Ulna
b) radius; Humerus;
K.C.S.E Biology Q & A - MODEL 2003PP1QN04
What is the role of the bacteria named in (a) above?
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K.C.S.E Biology Q & A - MODEL 2003PP1QN04
Name the bacteria found in root nodules of leguminous plants.
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K.C.S.E Biology Q & A - MODEL 2003PP1QN03
How do the male gamete nuclei reach the ovule after pollen grains land on the stigma?
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K.C.S.E Biology Q & A - MODEL 2003PP1QN02
Name the phylum whose members possess notochord
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K.C.S.E Biology Q & A - MODEL 2003PP1QN01
A process that occurs in plants is represented by the equation below.
C6H12O6 2C2H5OH + 2CO2 + Energy (Glucose) (Ethanol) (Carbon dioxide) a) Name the process. b) State the economic importance of the process named in (a) above
answers
a) Anaerobic respiration / fermentation; Acc. Alcohol production/ drawing dough.
b) Brewing/ Banking.
K.C.S.E Biology Q & A - MODEL 2002PP1QN20b
Describe how the cervical, lumbar and sacral vertebrae are suited to their functions.
answers
​ Cervical vertabrae
K.C.S.E Biology Q & A - MODEL 2002PP1QN20
Name three types of skeletons found in multicellular animals
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K.C.S.E Biology Q & A - MODEL 2002PP1QN19
Describe the role of hormones in the growth and development of plants.
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Indole acetic acid/IAA/ Auxins
K.C.S.E Biology Q & A - MODEL 2002PP1QN18
Two person X and Y drunk volumes of concentrated solution of glucose. The amount of glucose in their food was determined at intervals. The results are shown in the table below:
​a) On the grid provided, plot graphs of glucose level in blood against time on the same axes.
b) What was the concentration of glucose in the blood of X and Y at the 20th minute? X = 120 + -3) Y = 140 +-3) c) Suggest why the glucose level in person X stopped rising after 30 minutes while it continued rising in person Y. d) Account for the decrease in glucose level in person X after 30 minutes and person Y after 60 minutes (3 minutes) e) Name the compound that stores energy released during oxidation of glucose. f) Explain what happens to excess amino acids and development of plants.
answers
(a) – For exchanged axis award maximum 3 marks for points x identity
The scale must however be correct. For graphs on separate axis mark both and award the highest mark. (a) Axis = 2 (b) Scale = 1 (c) ( plotting) = 1 (d) curves) = 1 (b) X = 120 + -3) Y = 140 + -3 (c) Person X is capable of regulating glucose while person y is likely to be diabetic. X – Insulin (d) X insulin released, excess glucose is converted into glycogen ( in liver) must be mentioned if insulin is not mentioned Y Insulin not released, thus the decline is due to glucose being released in urine. (e) A.T.P / Adenosine triphosphate (f) Deaminated; resulting in formation of ammonia Ammonia combines with CO2 to form urea ( and H20); Urea is passed out in Urine carbohydrate group is oxidized/ stored as glycogen
K.C.S.E Biology Q & A - MODEL 2002PP1QN17
State four advantages of vegetation propagation.
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K.C.S.E Biology Q & A - MODEL 2002PP1QN17
Give a reason for grafting in plants
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