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WAEC Biology 2010 Question 30

Question 30

Nutrient Cycling

The bacterium in a mutualistic association with legumes converts

  1. A.nitrates to ammonia.
  2. B.ammonium compounds to nitrites.
  3. C.nitrogen gas to ammonia.
  4. D.nitrites to nitrates.
Show the answer and explanation

Answer: C (nitrogen gas to ammonia.)

Explanation

Rhizobium in legume root nodules fixes atmospheric nitrogen gas into ammonia, which the plant uses.