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What are the names of modified leaves enclosing bougainvillea flowers whose function is to
attract insect pollinators?
Date posted:
May 22, 2019
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Equal amounts of crushed Irish potato were placed in equal volumes of hydrogen peroxide solution
at indicated pH. The volume of the gas produced was measured and recorded as shown in the table
below.
(a) Name the gas that was produced.
(b)Account for the difference in the volume of the gas produced in pH 4.0 and pH 9.0
Date posted:
May 22, 2019
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Name the branch of Biology that involves the study of Organisms for the sake of classifying them.
Date posted:
May 22, 2019
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Explain the reason why growing grass dries when salt is sprinkled on it?
Date posted:
May 4, 2019
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Name two chemicals used to immobilize highly mobile animals during collection of small animals
Date posted:
April 28, 2019
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List down the three theories that explain the opening and closing of stomata.
Date posted:
April 26, 2019
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State two functions of mucus produced along the alimentary canal.
Date posted:
April 26, 2019
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A certain animal has no incisors no canine 6 premolars and 6 molars in its upper jaw. In the lower jaw there are 6 incisors 2 canine 6 premolars and 6 molars. Write its dental formula.
Date posted:
April 10, 2019
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How does the human eye obtain nutrients
Date posted:
April 1, 2019
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Name the features that increases the surface area of the small intestines.
Date posted:
April 1, 2019
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The diagram below shows a vertical section through a flower.
(a) Name the parts marked X and Y.
(b) Suggest the agent of pollination for the flower.
(c) Give a reason for your answer in (b) above.
Date posted:
April 1, 2019
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Name three gaseous constituents involved in gaseous exchange in plants.
Date posted:
March 26, 2019
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Explain why water logging of the soil may lead to death in plants.
Date posted:
March 26, 2019
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The diagram below shows part of plant tissue.
(i) Name the cell labelled X and part labelled W.
(ii) State two adaptations of cell labelled X to its functions.
Date posted:
March 22, 2019
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If the nerve supply to the heart of a mammal is servered, the rhythmic heart movement will still go on and the heart continues to beat. Explain this observation
Date posted:
March 22, 2019
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The action of pepsin stops in the duodenum. Explain.
Date posted:
March 22, 2019
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What is the importance of heartbeat in blood circulation?
Date posted:
March 22, 2019
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The figure below shows a stem of a plant growing round a tree trunk
a) What is the name of the response which causes such a twisted growth?
b) Explain how twisting process is accomplished
Date posted:
March 22, 2019
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State three features that a grasshopper, a crab, a spider and a millipede have in common.
Date posted:
March 22, 2019
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In what form is carbon IV oxide transported in blood?
Date posted:
March 22, 2019
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State the importance of each of the following features in animals;
a) Solid food being broken down into small pieces.
b) Presence of caecum in herbivorous mammals.
Date posted:
March 22, 2019
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Distinguish between identical twins and fraternal twins.
Date posted:
March 22, 2019
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Name the fins that prevent the following movements of fish during swimming.
(i) Yawing
(ii) Pitching
(iii) Rolling
Date posted:
March 22, 2019
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What happens when respiration exceeds photosynthesis in the guard cells of terrestrial plants?
Date posted:
March 22, 2019
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Two populations of the same species of birds were separated over a long period of time by an ocean. Both populations initially fed on insects only but later it was observed that one population fed entirely on fruits and seeds although insects were available. Name;
(a) The type of isolation.
(b) The type of evolutionary change.
(c) What are vestigial structures?
(d) Name one vestigial structure in man.
Date posted:
March 21, 2019
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Eight potato cylinder of the same size were used to investigate a certain physiological process. Four of the potato cylinders were placed in solution S. The other four potato cylinders were placed in solution T. After 2 hours, the potato cylinders from solution S were found to longer and stiff, while those from solution T were found to be shorter and flexible. Explain the
results in solution S and T.
(b) Distinguish between active transport and diffusion.
Date posted:
March 21, 2019
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List two enzymes that are secreted in their precursor forms.
Date posted:
March 21, 2019
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Three tubes each containing 1ml saliva and 1ml water were incubated in water baths at different temperatures as shown in the diagram below for 30 minutes. Another one tube containing 1ml starch solution was incubated for the same length of time in each water bath. The contents of the two tubes in each water bath was then mixed and incubated for further 30 minutes.The content of each tube was then tested for starch using iodine solution.
a) What was the aim of the experiment?
(b) Why was it necessary to incubate the tubes for 30 minutes before mixing their contents?
(c) State the colour changes you would expect to observe after adding iodine solution.
(d) Account for the expected observations.
Date posted:
March 21, 2019
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What biological knowledge or study is required in dealing with locusts that infest a maize crop.
Date posted:
March 21, 2019
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Describe the digestion, absorption and assimilation of milk in humans.
Date posted:
March 15, 2019