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Friday, 14 August 2026
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Biology Past Questions and Answers

Topic: Loss of soil fertility

Jamb Biology Questions - Loss of 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
View Answer & Explanation
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
View Answer & Explanation
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
View Answer & Explanation
Question 5:
5 g of oven dried soil was heated in a furnace for 24 hours. After cooling, it weighed 4.8 g. What is the amount of humus in the soil?
  • A 40.0g per 100 g dry soil
  • B 4.4g per 100g dry soil
  • C 4.0 g per 100g dry soil
  • D 0.4g per 100g dry soil
View Answer & Explanation