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WAEC Agricultural Science 1992 Question 8

Question 8

Soil Fertility and Plant Nutrition

Use the diagram (the nitrogen cycle, with stages labelled I to VIII) to answer this question. The salts denitrified in I are

Diagram for this question
  1. A.nitrites
  2. B.ammonium salts
  3. C.magnesium salts
  4. D.urea
  5. E.nitrates.
Show the answer and explanation

Answer: E (nitrates.)

Explanation

I receives nitrites from II by oxidation, so I is nitrates; denitrifying bacteria turn nitrates back into nitrogen gas.