Question 321:

• WAEC 1990

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

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

Question 322:

• 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 323:

• 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

Question 324:

• 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 325:

• WAEC 1990

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

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