Agricultural Science
WAEC 1995
(a) Identify specimens N and O provided, and P represented by the diagram.
(b) Name three animal hosts of each of specimens N, O, and P.
(c) Describe three damages done on their host by each of specimens N, O, and P.
Explanation
(a) ldentification:
- Specimen N - Liver fluke;
- O - tick;
- P - trypanosome Trypanosoma.
(b) Animal hosts of specimens N, O and P are:
- N - cattle, sheep, goat, horse/ donkey;
- O- cattle, sheep, goat, horse/donkey/dog/pig:
- P- sheep, goat, cattle.
(c) Damage done by the specimens on their hosts are:
Specimen N - Liver fluke,
- causes blockage of bile ducts and sucking of blood/ anaemia and this may cause internal bleeding or haemorrhage.
- It also burrows into the liver and causes loss of weight or emanciation and reduction in productivity.
Specimen 0-Tick:
- wounds or scars left on animal predisposes animal to bacterial infection or secondary infection /entry point for germs.
- It affects transmission of fever, anaemia (loss of blood),
- irritation or restlessness or tick worry and loss of appetite,
- It causes reduced quality of hide and skin and bring about loss of weight / emanciation, reductíon of production.
Specimen P- Trypanosome parasite;
- causes anaemia or loss of blood, fever/trypanosomiasis or nagana,
- loss of weight or productivity,
- emanciation,
- loss of tail hairs as well as oedema / swelling in the limbs and abdomen.
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