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Question 3
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a) Identify specimens M, N and 0 by their common names and their scientific names. [6 marks]
(b) (i) Name one pest and one disease that attack the crop from which specimen 0 is obtained.
[2 marks']
(ii) State one control measure for each of the pest and disease mentioned [2 marks]
3(b(i).
Mention three uses of specimen M.
State two methods of preserving specimen N. [3 marks]
(a) Identify specimens M, N and 0 by their common names and their scientific names. [6 marks]
(b) (i) Name one pest and one disease that attack the crop from which specimen 0 is obtained.
[2 marks']
(ii) State one control measure for each of the pest and disease mentioned
[2 marks]
3(b(i).
Mention three uses of specimen M.
[3 marks]
State two methods of preserving specimen N.
[2 marks] |
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The expected answers include:
Ways by which specimen P is adapted to survive in the host:
Head/scolex has suckers and hooks for firm attachment to host.
Head/scolex for sucking the nutrients and blood from host.
Has many segments/proglottids which have complete reproductive structures. These increase their survival.
They have both male and female reproductive structures, which favours self fertilization.
They secrete chemicals which ensure their freedom from digestive enzymes of host.
Nutrients are absorbed by all surfaces of the body/large surface area.
Formation of cysts around the bladderworm, ensuring the survival of the bladderworm in the reproductive cycle.
The proglottids contain several eggs which increase possibility of survival; even if several perish, many will still survive.
Body covered with tough cuticle which resists digestion by the host. |
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