SOIL - Jamb Biology Past Questions and Answers

Question 31:

• JAMB 1989

The seedlings in rice field were found to have thin lanky growth with reddish leaves and poor root development. This is because the soil lacks

A. Sulphur
B. Phosphorus
C. Potassium
D. Iron

Question 32:

• JAMB 1989

Most irrigated lands often become unproductive in later years because of

A. Loss of fertility
B. Increase in salinity
C. Soil erosion
D. Loss of water

Question 33:

• JAMB 1989

Farmers practise crop rotation because it

A. Helps to prevent soil erosion
B. Allows two crops to be planted at the same time
C. Helps to conserve soil fertility
D. Is an alternate to shifting cultivation

Question 34:

• JAMB 1990

An acidic soil can be improved upon by

A. Sedimentation
B. Leaching
C. Flocculation
D. Watering

Question 35:

• JAMB 1991

Fertilizers are lost from the soil through

A. Sheet erosion and evaporation
B. Leaching, underground seepages and run-off
C. Sheet erosion, gully erosion and wind erosion
D. Wind erosion and heavy rainfall