Which two distinct microbial processes areresponsible for the release of fixed nitrogenas dinitrogen gas $(N_2)$ to the atmosphere ?

  • [NEET 2013]
  • A

    Aerobic nitrate oxidation and nitritereduction

  • B

    Decomposition of organic nitrogen andconversion of dinitrogen to ammonium compounds

  • C

    Enteric fermentation in cattle and nitrogenfixation by Rhizobium in root nodules of legumes

  • D

    Anaerobic ammonium oxidation and denitrification.

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