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.
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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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K.C.S.E Biology Q & A - MODEL 2011PP1QN16
Describe the condition known as varicose veins.
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K.C.S.E Biology Q & A - MODEL 2011PP1QN15
Give reasons for carrying out the following procedures when preparing temporary wet mounts of plant tissues.
(a) Making thin plant sections. (b) Adding water on the plant section. (c) Placing a cover slip over the plant section.
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K.C.S.E Biology Q & A - MODEL 2011PP1QN14
The diagram below represents a certain plant.
​(a) What is the likely habitat for the plant?
(b) Give two reasons for your answer in (a) above.
answers
​(a) Dry/Arid/Semi-arid/Desert;
(b) Succulent/ fleshy stem; reduced leaves/leaves reduced into thorns/leaves modified into spines/spikes;
K.C.S.E Biology Q & A - MODEL 2011PP1QN13
State two functions of carbohydrates in the human body.
answers
K.C.S.E Biology Q & A - MODEL 2011PP1QN12
The diagram below represents a certain organism.
​State the phylum and class to which it belongs.
Phylum Class
answers
​Chordata; . Aves; .
K.C.S.E Biology Q & A - MODEL 2011PP1QN11
State the functions of the following parts of a light microscope.
(a)Fine adjustment knob. Stage.
answers
(a)Moves the body tube through smaller distances to bring the image/specimen/object into sharper focus;
(b)Platform where specimen (on slide) is placed;
K.C.S.E Biology Q & A - MODEL 2011PP1QN10
Name the site of anaerobic respiration in a cell.
answer
K.C.S.E Biology Q & A - MODEL 2011PP1QN10
Give two differences in the products of anaerobic respiration between plants and animals.
answers
(i) Lactic acid in animals while in plants it is ethanol/alcohol;
(ii) No carbon IV oxide produced in anaerobic respiration in animals while anaerobic respiration in plants produces carbon IV oxide; K.C.S.E Biology Q & A - MODEL 2011PP1QN09
The diagrams below illustrate the organs of some flowering plants.
​State the classes of plants to which each belong.
A B
answers
​(a) Dicotyledonae;
(b) Monocotyledonae;
K.C.S.E Biology Q & A - MODEL 2011PP1QN08
State three characteristics of the class crustacea.
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K.C.S.E Biology Q & A - MODEL 2011PP1QN07
The diagrams below show an experimental set-up to investigate a certain process in a plant tissue.
Explain the results obtained after 30 minutes.
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K.C.S.E Biology Q & A - MODEL 2011PP1QN06
What is meant by the following terms?
(a) Ecology. (b) Carrying capacity.
answers
​(a) This is the study of the inter-relationship between organisms and their environment;
(b) The maximum population of a species than a particular habitat can support; without depletion of resources. K.C.S.E Biology Q & A - MODEL 2011PP1QN05
The figure below illustrates a food web in a certain ecosystem.
From the food web:
(a) draw the shortest food chain; (b) identify the organisms with the highest (i) number of predators; (ii) biomass.
answers
(a) Grass > Grasshopper >- Lizards;
(b) (i) Chicken; (ii) Grass; K.C.S.E Biology Q & A - MODEL 2011PP1QN04
State one use for each of the following apparatus in the study of living organisms.
(a) Pooter (b) Pitfall trap
answers
(a) Sucking small insects/animals;
(b) A trap into which small animals fall and get trapped;
K.C.S.E Biology Q & A - MODEL 2011PP1QN03
Give three reasons for classifying organisms.
answers
​(i) Identify similarities and differences between organisms;
(ii) Organize scientific knowledge in an orderly system; (iii) Monitor emergence, presence and disappearance of organisms in and from the earth; (iv) Grouping organisms for easy stud
K.C.S.E Biology Q & A - MODEL 2011PP1QN02
Name two dental diseases.
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