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JAMB Biology 1980 Question 43

Question 43

Soil

Leguminous plants, e.g Mucana, are usually planted in cultivated farmlands because they

  1. A.enrich the soil with phosphates
  2. B.provide animal food
  3. C.enrich the soil with organic nitrogen
  4. D.protect the soil from being over-heated
  5. E.protect the microorganisms in the soil.
Show the answer and explanation

Answer: C (enrich the soil with organic nitrogen)

Explanation

Nitrogen-fixing bacteria in legume root nodules add nitrogen compounds to the soil.