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WAEC Biology 1993 Question 23

Question 23

Nutrient Cycling

Which of the following organisms reduces nitrates in the soil to gaseous nitrogen?

  1. A.Euglena
  2. B.Protozoan
  3. C.Denitrifying bacterium
  4. D.Parasitic mould
  5. E.Nitrifying bacterium
Show the answer and explanation

Answer: C (Denitrifying bacterium)

Explanation

Denitrifying bacteria change nitrates into nitrogen gas.