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Denitrification converts nitrate to

  • A.Gaseous nitrogen returned to the atmosphere
  • B.Ammonium held on the surfaces of clay particles
  • C.Nitrite that plant roots absorb directly
  • D.Amino acids locked up in microbial cells

Answer: A

Denitrifying bacteria use nitrate in place of oxygen as an electron acceptor and reduce it through nitrite and nitrous oxide to dinitrogen gas, which escapes the soil entirely. It is the main route by which fertiliser nitrogen is lost from waterlogged fields.

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