Waec Agricultural Science 1990 Past Questions and Answers

Question 6:

• WAEC 1990

A crop not requiring more than 750 mm annual rainfall is most suitable for cultivation in

A. Swampy forest
B. Sahel savanna
C. Rain forest
D. Sudan savanna
E. Guinea savanna

Question 7:

• WAEC 1990

The major factor influencing the physical or mechanical breakdown of rocks into finer particles include the following except

A. Man
B. Animal
C. Wind
D. Water
E. Solution

Question 8:

• WAEC 1990

Which of the following nutrient element is a macro-nutrient?

A. Phosphorus
B. Zinc
C. Iron
D. Manganese
E. Boron

Question 9:

• WAEC 1990

Which of the following is a disadvantage of using organic manure on the soil?

A. Spreading of pests and diseases
B. Reducing the rate of evaporation from soil surfaces
C. Improving the nitrogen content of soil
D. Increasing the humus content of soil
E. Preventing erosion and leaching

Question 10:

• WAEC 1990

Which of the following factors is not considered in 5the use of irrigation?

A. Weed seed distribution over the farm
B. Cost of maintenance
C. Availability of water
D. Build up of pests and diseases
E. Prevention of salt accumulation through adequate drainage