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WAEC Agricultural Science 2016 Question 12

Question 12

Soil Fertility and Plant Nutrition

Rhizobium supplies nitrogen to leguminous plants by

  1. A.incorporating urea into their bodies.
  2. B.fixing atmospheric nitrogen into the soil.
  3. C.decomposing plant and animal remains.
  4. D.decreasing the pH value of the soil.
Show the answer and explanation

Answer: B (fixing atmospheric nitrogen into the soil.)

Explanation

Rhizobium in root nodules fixes nitrogen gas from the air.