(a) What is weathering ?

(b) Enumerate three processes involved in rock weathering

(c) List and discuss briefly the agents of two of these processes

(a) Distinguish between irrigation and drainage (b) State and explain four systems of irrigation and two of drainage.

Describe briefly the economic importance and the control measures of the following: (a) Stem borers of cereal, (b) Grain weevils of stored produce: (c) Cotton stainer; (d) Cassava mealy bug

Write short notes on the following: (a) Selective exploration; (b) Deforestation; (c) Regeneration (d) Afforestation 

Discuss rinderpest disease of livestock under the following sub-headings: (a) Causal organism; (b) Transmission c) Symptoms (d) Effects and economic importance (e) Control