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Microbiology of Soils - Medical Science

Q1:

Denitrification is

A reduction of nitrate (NO3-) to nitrogen gas

B reduction of nitrate to organic nitrogen compounds

C both (a) and (b)

D changing of atmospheric nitrogen (N2) to nitrogen compounds

ANS:C - both (a) and (b)

Reduction of nitrate to organic compounds (proteins, amino acids) is called assimilation. Then why it is putting into denitrification category.