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Friday, 02 October 2026
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Biology Past Questions and Answers

Topic: Soil fertility

Jamb Biology Questions - Soil fertility

Question 1:
The farmer cannot check soil erosion effectively by
  • A Constructing is ridges of planting across the slope
  • B Cultivating cover crops
  • C Practising strip farming
  • D Clearing the land of vegetation
  • E Constructing terraces
View Answer & Explanation
Question 2:
28 g soil sample was heated to a constant weight of 24 g. When further heated to red hot and cooled, it weighed 18 g. What is the percentage of humus in the soil?
  • A 22.2
  • B 55.6
  • C 75.0
  • D 25.0
  • E 35.7
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Question 3:
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
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Question 4:
Soil erosion CANNOT be controlled by
  • A Planting cover crops
  • B Contouring of sloping ground
  • C Terracing of slopes
  • D Laying of mulch
  • E Burning of bush
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Question 5:
The following are methods of soil conservation EXCEPT
  • A Contour terracing
  • B Strip cropping
  • C Contour ploughing
  • D Mixed grazing
View Answer & Explanation