Jamb Biology 1984 Past Questions and Answers

Question 46:

• JAMB 1984

Leaching is

A. Washing away of humus from the soil surface
B. Reducing of soil aeration by pressure
C. Soil erosion by means other than rainfall
D. Loss of organic matter due to exposure to direct sunlight
E. Washing out chalk and limestone from upper layers of by heavy rains

Question 47:

• JAMB 1984

The process of soil erosion is usually from

A. Rill → sheet → gully
B. Gully → rill → sheet
C. Sheet → guly → rill
D. Sheet → rill → gully
E. Rill → gully → sheet

Question 48:

• JAMB 1984

The structure above represents a quill feather. The structure labelled 'M' is the

A. Quill
B. Rachis
C. Superior umbilicus
D. Inferior umbilicus
E. Aftershaft

Question 49:

• JAMB 1984

The young chick is formed from

A. 3
B. 3 and 4
C. 1, 3 and 5
D. 2
E. 4