Which two distinct microbial processes are responsible for the release of fixed nitrogen as dinitrogen gas $(N_2)$ to the atmosphere?

  • A
    Aerobic nitrate oxidation and nitrite reduction
  • B
    Decomposition of organic nitrogen and conversion of dinitrogen to ammonium compounds
  • C
    Enteric fermentation in cattle and nitrogen fixation by Rhizobium in root nodules of legumes
  • D
    Anaerobic ammonium oxidation and denitrification

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Which of the following is a bacterium involved in denitrification?

The conversion of ammonia into nitrites and nitrates is called

The process of conversion of nitrogen gas into ammonia is called $P$,and the process of decomposition of organic nitrogen in plants and animals into ammonia is called $Q$.

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Study the nitrogen cycle process shown below and select the option that correctly identifies the four blanks $A, B, C,$ and $D$ in the context of nitrogen transformation.

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