Waec Agricultural Science 1990 Past Questions and Answers

Question 11:

• WAEC 1990

By which of the following ways is the agricultural production in Nigeria affected by topography

A. Lowering of crop quality
B. Determining the manure requirement of a farm
C. Lowering the leve of production
D. Increasing the pest incidence on crops
E. Influencing the area of land, actually available for agriculture

Question 12:

• WAEC 1990

Which of the following will not contribute to soil formation in Nigeria?

A. Carbonation
B. Oxidation
C. Temperature
D. Hydrolysis
E. Glaciation

Question 13:

• WAEC 1990

The type of soil formed is affected by the following factors except

A. Farming systems
B. Climate
C. Vegetation
D. Topography
E. Parent material

Question 14:

• WAEC 1990

Which of the following is the function of nitrosomonas in the nitrogen cycle?

A. Ammonification
B. Volatilization
C. Nitrification
D. Dentrification
E. Nitrogen fixation

Question 15:

• WAEC 1990

Which of the following farm practices does not have a very harmful effect on the soil?

A. Crop rotation
B. Land clearing
C. Overgrazing
D. Flooding
E. Bush burning