a) (i) Describe the life cycle of louse. (ii) State three effects of louse on its host. (iii) State three ways in which louse could be controlled. (iv) Name...
Question 1 Report
a) (i) Describe the life cycle of louse.
(ii) State three effects of louse on its host.
(iii) State three ways in which louse could be controlled.
(iv) Name three farm animals that could be infested by louse.
b) Discuss coccidiosis in farm animals under the following headings:
(i) two animals mostly affected;
(ii) causal agent;
(iii) two symptoms;
(iv) two control measures
Answer Details
(a)(i) Life cycle of the louse
The louse has a simple (incomplete) life cycle completed entirely on the host: the adult female lays eggs (nits) cemented to the hair or feathers of the host; each egg hatches into a nymph which resembles the adult; the nymph feeds and moults several times to become a mature adult that mates and lays more eggs.
(ii) Three effects of louse on its host
- Causes irritation, restlessness and rubbing.
- Causes anaemia and loss of condition (blood-sucking types).
- Leads to loss of hair/feathers, reduced production, and may transmit disease.
(iii) Three ways of controlling louse
- Dusting or spraying the animals with a suitable insecticide.
- Dipping the animals in an acaricide/insecticide wash.
- Maintaining good hygiene and isolating infested animals.
(iv) Three farm animals that could be infested by louse
- Cattle.
- Sheep (or goat).
- Poultry (fowl).
(b) Coccidiosis
- Two animals mostly affected: poultry (chicken) and rabbit.
- Causal agent: a protozoan of the genus Eimeria.
- Two symptoms: blood-stained diarrhoea; loss of appetite, weakness and ruffled feathers with reduced growth.
- Two control measures: add a coccidiostat to the feed or water; maintain good sanitation with dry litter and avoid overcrowding.
Download The App On Google Playstore
Everything you need to excel in your exams
