Jamb Biology 1986 Past Questions and Answers

Question 46:

• 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 47:

• JAMB 1986

The following are methods of soil conservation EXCEPT

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

Question 48:

• 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 49:

• JAMB 1986

Which of the labelled parts will develop into a new maize plant?

A. 2
B. 3
C. 4
D. 5

Question 50:

• JAMB 1986

The structure labelled 1 is the

A. Plumule
B. Radicle
C. Cell membrane
D. Seed coat