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JAMB Biology 1989 Question 48

Question 48

Soil

Farmers practise crop rotation because it

  1. A.helps to prevent soil erosion
  2. B.allows two crops to be planted at the same time
  3. C.helps to conserve soil fertility
  4. D.is an alternative to shifting cultivation
Show the answer and explanation

Answer: C (helps to conserve soil fertility)

Explanation

Growing different crops in turn (including legumes) stops one crop exhausting the same nutrients, so soil fertility is kept.