Waec Agricultural Science 1992 Past Questions and Answers

Question 11:

• WAEC 1992

Chlorosis observed along the veins of leaves is a characteristic symptom for the deficiency of

A. Nitrogen
B. Magnesium
C. Potassium
D. Phosphorus
E. Sulphur

Question 12:

• WAEC 1992

The removal of excess water from the soil surface and the upper subsoil is known as

A. Irrigation
B. Drainage
C. Evaporation
D. Surface turn-off
E. Dehydration

Question 13:

• WAEC 1992

Which of the following is not an effect of manuring on the soil?

A. Adding plant nutrients to the soil
B. Releasing adequate plant nutrients of the appropriate time
C. Facilitating soil aeration and movement of soil moisture
D. Enhancing the activities of soil microorganisms
E. Improving the structure of the soil

Question 14:

• WAEC 1992

A soil with low PH value can be improved by the addition of

A. Ammonium sulphate
B. Calcium carbonate
C. Sodium chloride
D. Sodium nitrate
E. Magnesium phosphate

Question 15:

• WAEC 1992

Which of the following factors will cause etiolation in crops?

A. Law humidity
B. High light intensity
C. High humidity
D. Low temperature
E. Absence of light