Mastering KCSE Biology with Comprehensive Topical Questions and Answers
Give one reason why the coarse adjustment knob should not be used to lower the high power objective.30/6/2020
K.C.S.E Biology Q & A - MODEL 2017PP1QN09
Give one reason why the coarse adjustment knob should not be used to lower the high power objective.
answers
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K.C.S.E Biology Q & A - MODEL 2017PP1QN09
State the function of a mirror in a light microscope.
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K.C.S.E Biology Q & A - MODEL 2017PP1QN08
Explain why short distance runners breathe quickly and deeply at the end of a race.
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K.C.S.E Biology Q & A - MODEL 2017PP1QN07
The diagram below represents a stage in the division of a cell.
​With a reason, identify the organism from which the cell was obtained.
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K.C.S.E Biology Q & A - MODEL 2017PP1QN06
Name two enzymes in the human digestive system which are secreted in an inactive form.
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K.C.S.E Biology Q & A - MODEL 2017PP1QN05
The photograph illustrates a housefly at various stages of its development.
​(a) (i) On the photograph, name the stages of the life cycle.
(ii) Using arrows, link the stages of the life cycle in the correct order. (b) (i) State two differences between the life cycles of a housefly and that of a cockroach. (ii) State one advantage of the life cycle of a cockroach to itself. K.C.S.E Biology Q & A - MODEL 2017PP1QN04
In an experiment on respiration, a mouse was observed to have inhaled 200 cm3 of oxygen and exhaled 199.75 cm3 of carbon(IV) oxide in ten minutes.
​(a) Calculate the respiratory quotient for the activity in the experiment.
(b) Identify the possible food substance consumed by the mouse. (c) State the fate of the excess food named in (b) above in the human body. K.C.S.E Biology Q & A - MODEL 2017PP1QN03
During a practical investigation on food tests, students were provided with the following reagents.
Benedict’s solution Sodium hydrogen carbonate Dilute hydrochloric acid.
​(a)Identify the food substance the students were to test.
(b) State the role of dilute hydrochloric acid and sodium hydrogen carbonate during the experiment. (i) Dilute hydrochloric acid (ii) Sodium hydrogen carbonate
answers
​a) Non reducing sugar;
b) (i) Hydrolyze/break down sucrose! non reducing sugars to reducing sugars/glucose/fructose; (ii) neutralize the acid; K.C.S.E Biology Q & A - MODEL 2017PP1QN02
Below are diagrams of a cell organelle obtained from different organs of an animal
​(a) (i) For each organelle state an organ in the urinary system where it is likely to be found.
F G (ii) Give a reason for your answers in (a) (i) on page 2. (b) Name the part of the chloroplast where the following reactions occur: (i) Carbon(IV) oxide fixation (ii) Photolysis
answers
(a) (i) F - Kidney;
G - Bladder/Ureter/Urethra; ii) Kidney - active re-absorption of solutes requires more energy; organelle F has more cristae for attachment of more respiratory enzymes producing more energy; Bladder/ureter/urethra does not require as much energy/organelle G has less number of cristae hence fewer respiratory enzymes attached/less energy produced; (b) i) Stroma; ii) Grana/granurn; K.C.S.E Biology Q & A - MODEL 2017PP1QN01
Below is an illustration of a piece of apparatus strategically positioned to trap some organisms.
​(a) Name the apparatus.
(b) State the function of the part labelled E.
answers
​a) Pooter/Aspirator;
b) To prevent dirt/insects from entering the suction tube/into the mouth;
K.C.S.E Biology Q & A - MODEL 2016PP2QN02
Explain why people with sickle cell trait have an adaption survival advantage over normal individuals in malaria endemic regions.
ANSWERS
K.C.S.E Biology Q & A - MODEL 2016PP1QN30
State two advantages of hybrid vigour
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K.C.S.E Biology Q & A - MODEL 2016PP1QN29
Name two tissues in plants that provide mechanical support
ANSWERS
K.C.S.E Biology Q & A - MODEL 2016PP1QN29
State a characteristic that is common to all cervical vertebrae
ANSWER
K.C.S.E Biology Q & A - MODEL 2016PP1QN28
The diagram below shows a transverse section of a plant organ
​(a) Name the plant organ from which the section was obtained.
(b) (î) Name the class to which the organism from which section was obtained belongs. (ii) Give a reason for your answer in b (i) above. ​(c) Name the part labeled X
answers
(a) Stem
(b) (i) Monocotyledonae (ii) Vascular bundles are scattered and not arranged in a ring Absence of pith/ cambium (c) Epidermis
K.C.S.E Biology Q & A - MODEL 2016PP1QN27
Name the opening to the chamber of the heart of an insect.
answer
K.C.S.E Biology Q & A - MODEL 2016PP1QN27
Name an organism which has a single circulatory system.
answer
K.C.S.E Biology Q & A - MODEL 2016PP1QN27
What is single circulatory system?
answer
K.C.S.E Biology Q & A - MODEL 2016PP1QN26
State the functions of the following parts of a microscope.
(a) Objective Lens (b) Diaphragm
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K.C.S.E Biology Q & A - MODEL 2016PP1QN24
How does nutrition as a characteristic of living organisms differ in plants and animals?
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K.C.S.E Biology Q & A - MODEL 2016PP1QN23
​
State two functions of saliva.,
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K.C.S.E Biology Q & A - MODEL 2016PP1QN23
Name one salivary gland in humans.
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K.C.S.E Biology Q & A - MODEL 2016PP1QN22
State three characteristics of the class Crustacea.
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K.C.S.E Biology Q & A - MODEL 2016PP1QN21
​The figure below illustrates a food web in a certain ecosystem.
​From the food web:
(a) Draw the shortest food chain (b) Identify the organism with the highest: (i) number of predators (ii) biomass
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