Waec Agricultural Science 2000 Past Questions and Answers

Question 66:

• WAEC 2000

(a) Write short notes on the following systems of breeding: (i) In-breeding; (ii) Line-breeding; (iii) Cross-breeding
(b) State three methods of collecting semen from a proven male for use in artificial insemination.

Question 67:

• WAEC 2000

(a) State the law of diminishing returns as it applies to agricultural production. [2 marks] Study the table below and use it to answer questions (b) and (c).

Size of farm (ha)	Qty of fertilizer used (bags)	Yield of maize (bags)	Change of Qty of fertilizer	Change in yield of maize (bags)
2	0	8	-	-
2	8	24	-	-
2	12	48	-	-
2	26	80	-	-
2	20	120	-	-
2	24	150	-	-
2	28	170	-	-
2	32	180	-	-
2	34	180	-	-
2	36	170	-	-

(b) Complete the table above. (c) Draw a graph from the provided data and use it to explain the law of diminishing returns