Question 3
- Discuss the Onion twister disease under the following headings:
(i) causative organism;
(ii) mode of transmission
(iii) one symptom;
(iv) two control measures
- State five adverse effects of insect-pests on crop production. [5 marks]
- (Outline four desirable qualities to be considered in selecting a breeding stock in pig production. [4 marks]
- (d) List four characteristics of beef cattle. [4 marks]
Observation
This question was the most popular among the candidates. Most of the candidates were able to discuss the causative organism, mode of transmission, symptom and control measures of onion twister disease as required in 3(a). Also, most of the candidates were able to state the adverse effects of insect- pests on crop production, outline the desirable qualities to be considered in selecting a breeding stock in pig production and list the characteristics of beef cattle as required in 3(b,c and d) respectively