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Nitrogen fixation and nitrification differ in that fixation

  • A.Removes nitrogen from the soil while nitrification adds it
  • B.Requires oxygen while nitrification is strictly anaerobic
  • C.Is carried out by plants while nitrification is carried out by bacteria
  • D.Brings new nitrogen into the soil while nitrification only changes its form

Answer: D

Fixation converts atmospheric dinitrogen into a combined form, adding to the soil's total nitrogen, whereas nitrification merely oxidises ammonium already present into nitrate. Nitrification is the aerobic process of the two, and neither is carried out by plants.

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