Waec Agricultural Science 1989 Past Questions and Answers

Question 16:

• WAEC 1989

Rhizobium supplies nitrogen to leguminous plants by

A. Changing some mineral salts to sulphate of ammonia
B. Incoporating urea into its body
C. Fixing atmospheric nitrogen
D. Decomposing plant remains
E. Increasing the PH value of the soil

Question 17:

• WAEC 1989

The advantage of providing drainage ditches in farms is that it

A. Requires periodic clearing
B. Is inconvenient for farm mechanization
C. Is labour intensive
D. Is unsuitable for draining basement of farm buildings
E. Is easily adopted by samll scale farmers

Question 18:

• WAEC 1989

Which of the following sources of farm power cannot be effectively used for processing agricultural products?

A. Animals
B. Electricity
C. Sun
D. Machines
E. Wind

Question 19:

• WAEC 1989

The instrument used to measure the relative humidity is

A. Thermometer
B. Anemometer
C. Hygrometer
D. Hydrometer
E. Rain gauge

Question 20:

• WAEC 1989

The most important limitation of agricultural mechanization is

A. Small holdings
B. Lack of technical know-how
C. Poor marketing system
D. Inadequate storage facilities
E. Pest attack