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(a) X Centriole
Y Axial filament
(b) W / acrosome release (hydrolytic) enzymes which digest the plasma membrane of ovum enabling the penetration of
sperm.
Z / middle piece has many mitochodria; to generate energy; (used in swimming of the sperm cell towards ovum
(d) Formation of spindle fibres / pay a role in cell division
sharon kalunda answered the question on March 21, 2019 at 13:52
- The figure shown below represents a kidney nephron. Use it to answer the questions that follow.(Solved)
The figure shown below represents a kidney nephron. Use it to answer the questions that follow.
(a) (i) X is made up of a tuft of capillaries. How do they differ from other capillaries in the body?
(ii) What structural difference exist between W and Z?
(iii) State the significance of the difference stated in (a) (ii) above.
(b) State three adaptations that enable P to perform its function.
(c) What is counter flow and in which part of the nephron does it occur.
Date posted: March 21, 2019. Answers (1)
- An experiment was carried out to investigate the effect of hormones on growth of lateral buds of three pea plants.
The shoots were treated as follows.
(a)...(Solved)
An experiment was carried out to investigate the effect of hormones on growth of lateral buds of three pea plants.
The shoots were treated as follows.
(a) Shoot A – Apical bud was removed.
(b) Shoot B – Apical bud was removed and gibberellic acid placed on the cut shoot.
(c) Shoot C – Apical bud was left intact.
The lengths of the branches developing from the lateral buds were determined at regular intervals. The results obtained are shown in the table below.
(i) Using the same axes, draw graphs to show the lengths of branches against time.
(ii) (a) What was the length of the branch in Shoot B on the 7th day?
(b) What would be the expected length of the branch developing from Shoot B on the 11th day?
(iii) Account for the results obtained in the experiment.
(iv) Why was Shoot C included in the experiment?
(v) What is the importance of gibberellic acid in agriculture?
vi)State two physiological processes that are brought about by the application of gibberellic acid on plants.
Date posted: March 21, 2019. Answers (1)
- Describe the role of hormones in the mammalian female reproductive cycle.(Solved)
Describe the role of hormones in the mammalian female reproductive cycle.
Date posted: March 21, 2019. Answers (1)
- The diagram shown below represents a male reproductive system.(Solved)
The diagram shown below represents a male reproductive system.
(a) Name the structure labelled X.
(b) Name two substances that pass through structure labelled Y.
Date posted: March 21, 2019. Answers (1)
- Name causative agents of each of the following diseases.
(a) Typhoid
(b) Malaria(Solved)
Name causative agents of each of the following diseases.
(a) Typhoid
(b) Malaria
Date posted: March 21, 2019. Answers (1)
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The set up shows an experiment to investigate photosynthesis.
i) What gas was collected in the test tube?
ii) What was the role of sodium hydrogen carbonate in the experiment?
Date posted: March 21, 2019. Answers (1)
- (a) Name the part of the eye in which the light sensitive cells are located.
(b) List the two types of sensory cells found in...(Solved)
(a) Name the part of the eye in which the light sensitive cells are located.
(b) List the two types of sensory cells found in the part named in (a) above.
Date posted: March 21, 2019. Answers (1)
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Which two classes of phylum arthropoda have their head fused with the thorax?
Date posted: March 21, 2019. Answers (1)
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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. Answers (1)
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Describe an experiment you would carry out to demonstrate that xylem transports water
Date posted: March 19, 2019. Answers (1)
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What will happen in the stomach during digestion if mucus is absent?
Date posted: March 17, 2019. Answers (1)
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What determines the type or mode of placentation of a flower ovary?
Date posted: March 17, 2019. Answers (1)
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Date posted: March 16, 2019. Answers (1)
- (a)Explain the role of pituitary gland in reproduction.(ii)State one function of thyroxine.(Solved)
(a)Explain the role of pituitary gland in reproduction.
(b)State one function of thyroxine.
Date posted: March 15, 2019. Answers (1)
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Name the enzymes that complete carbohydrate digestion in the ileum of humans.
Date posted: March 15, 2019. Answers (1)
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Explain why the heart of a frog continues to beat after the head has been cut off.
Date posted: March 15, 2019. Answers (1)
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Name the two bones that form the ball and socket joint in the upper limb of a mammal.
Date posted: March 15, 2019. Answers (1)
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Explain why the leaf of a bean plant wilts in the afternoon on hot days but appear turgid early the following morning.
Date posted: March 15, 2019. Answers (1)
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Date posted: March 15, 2019. Answers (1)
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Distinguish between antigen and antibody.
Date posted: March 15, 2019. Answers (1)