(a) State four ways in which weeds are beneficial to the farmer. [4 marks] (b) Classify insect-pests in three groups based on their mode of feeding and give...

(a) State four ways in which weeds are beneficial to the farmer. [4 marks] 
(b) Classify insect-pests in three groups based on their mode of feeding and give two examples of each [9 marks] 
(c) State three ways by which pasture can be made available to cattle. [3 marks]