Mastering KCSE Biology with Comprehensive Topical Questions and Answers
K.C.S.E Biology Q & A - MODEL 2012PP1QN22
State the importance of divergent evolution to organisms.
answer
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K.C.S.E Biology Q & A - MODEL 2012PP1QN21
Name the process through which free atmospheric nitrogen is converted into nitrates.
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K.C.S.E Biology Q & A - MODEL 2012PP1QN20
State three aspects that can be used to estimate growth in seedlings
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K.C.S.E Biology Q & A - MODEL 2012PP1QN19
List four symptoms of diabetes mellitus.
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K.C.S.E Biology Q & A - MODEL 2012PP1QN18
Why are plants able to accumulate most of their waste products for long?
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K.C.S.E Biology Q & A - MODEL 2012PP1QN17
Name two substances that leave the foetal blood through the placenta.
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K.C.S.E Biology Q & A - MODEL 2012PP1QN16
The diagram below represents an experimental set-up used by students to investigate a certain process.
​Flower Q produced seeds while P did not. Account for the results.
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K.C.S.E Biology Q & A - MODEL 2012PP1QN15
What name is given to a group of hormones that controls the development of secondary sexual characteristics in a human male?
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K.C.S.E Biology Q & A - MODEL 2012PP1QN14
Name the type of respiration that is most efficient.
b) Give a reason for your answer in (a) above
answer
a)Aerobic respiration;
b)It releases more energy per unit mass;
K.C.S.E Biology Q & A - MODEL 2012PP1QN13
State three factors that affect the rate of diffusion.
answers
Temperature; surface area; distance that particles have to travel; diffusion/concentration gradient; size/density of particles; surface area to volume ratio; thickness of membrane; medium of diffusion
K.C.S.E Biology Q & A - MODEL 2012PP1QN12
Why is it recommended to keep the stage of the microscope dry?
answers
Name the part of a light microscope used to bring an image of a specimen into sharp focus.26/6/2020
K.C.S.E Biology Q & A - MODEL 2012PP1QN12
Name the part of a light microscope used to bring an image of a specimen into sharp focus.
answer
K.C.S.E Biology Q & A - MODEL 2012PP1QN11
Name the muscles found in the following organs:
stomach; bone
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K.C.S.E Biology Q & A - MODEL 2012PP1QN11
State two ways in which heart muscles are special.
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K.C.S.E Biology Q & A - MODEL 2012PP1QN10
What is meant by the term irritability?
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K.C.S.E Biology Q & A - MODEL 2012PP1QN09
State the importance of negative phototaxis to termites.
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What is the probability of a couple with blood group AB getting a child with blood group AB?26/6/2020
K.C.S.E Biology Q & A - MODEL 2012PP1QN08
What is the probability of a couple with blood group AB getting a child with blood group AB?K.C.S.E Biology Q & A - MODEL 2012PP1QN07
The diagram below represents a set-up that students used in an investigation.
​(a) Name the physiological process that was being investigated.
(b) State the role of potassium hydroxide in flask K. (c) Account for the observation in boiling tube L and flask N. L . N
answers
​(a) Respiration/aerobic respiration;
(b) Flask K Potassium hydroxide removes Carbon IV Oxide from atmospheric air; (c) L - Lime water remains clear because Carbon (IV) Oxide has been removed; Flask N lime water forms a white precipitate because the respiring cockroaches produce Carbon (IV) Ovide; K.C.S.E Biology Q & A - MODEL 2012PP1QN06
The diagram below represents part of the gaseous exchange system in human.
​(a) Name the parts labelled F and G.
F G (b) State one function of each of the parts labelled H and J. H J
answers
​(a) F - Bronchiole;
G - Intercostal muscles/external intercostal muscles; (b) H - (Pleural membranes) secretes encloses pleural fluid to lubricate lungs/protect lungs; J - (Diaphragm) separates chest cavity from abdominal cavity/works to effect volume and pressure changes in chest cavity necessary for inhalation and exhalation! Ventilation/breathmg; K.C.S.E Biology Q & A - MODEL 2012PP1QN05
The table below shows results of a study of three plants C, D and E growing in different habitats.
(a) Which one of the plants C, D and E grows in an area of relatively low water availability?
(b) Explain your answer in (i) above.
answers
​(a) Plant C;
(b) Thick cuticle reduces water loss; Low number of stomata reduces water loss; Large root-surface area enhances water absorption; K.C.S.E Biology Q & A - MODEL 2012PP1QN04
In an investigation, a student extracted three pieces of paw paw cylinders using a cork borer.
The cylinders were cut back to 50 mm length and placed in a beaker containing a solution. The results after 40 minutes were as shown in the table below.
​(a) Account for the results in the table above.
(b) What would be a suitable control set-up for the investigation?
answers
​(a) The solution was hypotonic/less concentrated compared to the cell sap of pawpaw cylinder cells;
The tissue/cells gained water by osmosis; becoming turgid/longer/stiff; (b) Pawpaw cylinders of the same size/length; placed in an isotonic solution; Boiled potato cylinders of the same size; placed in a similar solution; K.C.S.E Biology Q & A - MODEL 2012PP1QN03
The figure below is a fine structure of a generalised animal cell as seen under an electron microscope.
​(a) Name the parts labelled A and B.
A B (b) How is the structure labelled B adapted to its function?
answers
​(a) (i) A - nucleopore;
B - Rough Endoplastic Reticulum; (b) Surface covered with ribosomes; for protein synthesis; Has interconnected channels: for transportation of proteins; K.C.S.E Biology Q & A - MODEL 2012PP1QN02
The diagram below represents a certain organism collected by a student at the sea shore.
​(a) Name the class to which the organism belongs.
(b) Give three reasons for your answer in (a) above.
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K.C.S.E Biology Q & A - MODEL 2012PP1QN01
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 2011PP1QN29
State four reasons why water is significant in seed germination.
ANSWER
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