Mastering KCSE Biology with Comprehensive Topical Questions and Answers
K.C.S.E Biology Q & A - MODEL 2011PP2QN03
Describe how oxygen in the alveolus reaches the red blood cells.
answers
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K.C.S.E Biology Q & A - MODEL 2011PP2QN03
Name the causative agents for the following respiratory diseases.
(i) Whooping cough. (ii) Pneumonia.
answers
(a) (i) Bordetella pertussis;
(ii) Streptococcus pneumoniae; (iii) Micoplasma pneumoniae;
K.C.S.E Biology Q & A - MODEL 2011PP2QN02
Explain how comparative embryology is an evidence for organic evolution.
answer
K.C.S.E Biology Q & A - MODEL 2011PP2QN02
Name two disorders in humans that are determined by sex-linked genes.
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K.C.S.E Biology Q & A - MODEL 2011PP2QN02
In humans, hairy ears is controlled by a gene on the Y Chromosome.
(a) Using letter Y^H to represent the chromosome carrying the gene for hairy ears, work out a cross between a hairy eared man and his wife. (b) (i) What is the probability of the girls having hairy ears? (ii) Give a reason for your answer in (b(i) above. K.C.S.E Biology Q & A - MODEL 2011PP2QN01
The set-up below illustrates a procedure that was carried out in the laboratory with a leaf plucked from a green plant that had been growing in sunlight.
(i) What was the purpose of the above procedure?
(ii) Give reasons for carrying out steps A, B and C in this procedure. A B C (iii) Name the reagent that was used at the step labelled D. (iv) State the expected result on the leaf after adding the reagent named in (iii) above.
ANSWERS
​(i) - Testing a leaf for the presence of starch;
(ii) - A - kill the leaf/break down cells/stop enzymatic activity; B - Removal of chlorophyll; C - Soften leaf/makes leaf less brittle; (iii) Iodine solution; (iv) Areas where starch is present stain blue/blue black;
K.C.S.E Biology Q & A - MODEL 2011PP1QN29
State four reasons why water is significant in seed germination.
ANSWER
K.C.S.E Biology Q & A - MODEL 2011PP1QN28
State two ways by which auxins regulate growth in seedlings.
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K.C.S.E Biology Q & A - MODEL 2011PP1QN28
What is a tropic response?
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K.C.S.E Biology Q & A - MODEL 2011PP1QN27
The diagram below represents features of a joint in a mammal.
​(a)Name the part labelled A.
(b) State the function of the part labelled B.
ANSWERS
​(a) Ligament;
(b) Secretes synovial fluid; contains/holds the synovial fluid in place;
K.C.S.E Biology Q & A - MODEL 2011PP1QN26
Name the gamete cells that are produced by the ovaries.
ANSWERS
K.C.S.E Biology Q & A - MODEL 2011PP1QN25
State one economic importance of each of the following plant excretory products.
(a) Tannin. (b) Quinine. (c) Caffeine.
ANSWERS
K.C.S.E Biology Q & A - MODEL 2011PP1QN24
What would be the expected results from a test cross?
ANSWERS
K.C.S.E Biology Q & A - MODEL 2011PP1QN24
Differentiate between the following terms:
(i)dominant gene and recessive gene: (ii) continuous variation and discontinuous variation.
ANSWERS
​(i) Dominant gene expresses itself phenotypically in both its homozygous and heterozygous states while recessive gene can only express itself phenotypically in the homozygous state;
(ii) Continuous variation is a characteristic for which there is a continuum or range while discontinuous variation is a characteristic for which there are discrete categories or units; K.C.S.E Biology Q & A - MODEL 2011PP1QN23
The diagram below represents a transverse section of an ovary from a certain flower.
a) (i)Name the structure labelled W.
(ii)Name the type of placentation illustrated in this diagram. (b) Give an example of a plant whose flowers have the type of placentation named in (a)(ìi) above.
ANSWERS
(a) (i) Ovule;
(ii) Axile placentation; (b) Orange or any correctly named citrus plant;
K.C.S.E Biology Q & A - MODEL 2011PP1QN22
State the difference in content of oxygen and carbon (IV) oxide in the air that enters and leaves the human lungs.
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K.C.S.E Biology Q & A - MODEL 2011PP1QN21
State two limitations of fossils as an evidence of evolution.
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K.C.S.E Biology Q & A - MODEL 2011PP1QN21
What is meant by convergent evolution?
answer
K.C.S.E Biology Q & A - MODEL 2011PP1QN20
The number of stomata on the lower and upper surfaces of two leaves from plant species X and Y were counted under the field of view of a light microscope. The results were as shown in the table below.
​(a) Which of the two leaves would be expected to have a lower rate of transpiration?
(b) Give a reason for your answer in (a) above.
answers
K.C.S.E Biology Q & A - MODEL 2011PP1QN19
Write an equation that sum manses the process of aerobic respiration.
answers
​Glucose + Oxygen (enzyme)=Carbon IV oxide + water + energy;
C6 H12 06+602 (enzyme)= 6C02+6H20 + ATP
K.C.S.E Biology Q & A - MODEL 2011PP1QN19
Apart from the lungs, name two gaseous exchange surfaces in a frog.
answers
K.C.S.E Biology Q & A - MODEL 2011PP1QN18
State two functions of saliva.
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K.C.S.E Biology Q & A - MODEL 2011PP1QN18
Name one salivary gland in humans,
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K.C.S.E Biology Q & A - MODEL 2011PP1QN17
The diagram below represents part of the human digestive system.
(a) Name the organs labelled L and M.
L M . (b) (i) Name the substance produced by the organ labelled K. (ii) State the function of the substance named in b(i) above.
answers
​.(a) L - Duodenum;
M - Pancreas; (b) (i) Bile; (ii) Emulsification/emulsifies fats; (iii) Provides alkalinic medium for enzyme action. (iv) Neutralizes acidic chyme.
K.C.S.E Biology Q & A - MODEL 2011PP1QN16
What is the role of blood platelets in the blood clotting process?
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