SOIL - Jamb Biology Past Questions and Answers

Question 21:

• JAMB 1985

The initial volume of water poured into 60g bag of dry soil was 50ml and the amount that drained through was 35ml. The percentage water content of the fully soaked soil is therefore

A. 46.7
B. 25.0
C. 20.0
D. 30.0
E. 58.3

Question 22:

• JAMB 1986

A larger percentage of tropical soils tends to be acidic because they

A. Contain large quantities of potash
B. Contain large quantities of lime
C. Lose a high proportion of their organic matter to running water
D. Lose lime and potash from the top soil through rain action

Question 23:

• JAMB 1986

The following are methods of soil conservation EXCEPT

A. Contour terracing
B. Strip cropping
C. Contour ploughing
D. Mixed grazing

Question 24:

• JAMB 1986

Sample of different soil types are packed in glass tubes whose lower ends are plugged with cotton wool, if these tubes are suspended in a trough of water, water will rise highest after a few hours in

A. Sand
B. Loamy
C. Clay
D. Humus

Question 25:

• JAMB 1987

Which of the following relates to edaphic factors?

A. The structure of the earth's surface
B. The influence of living organisms on each other
C. Temperature, rainfall and humidity
D. The influence of soils on plant and animals