Which two distinct microbial processes areresponsible for release of fixed nitrogenas dinitrogen gas

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12.Ecosystem

normal

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

Aerobic nitrate oxidation and nitritereduction

Decomposition of organic nitrogen andconversion of dinitrogen to ammonium compounds

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

Anaerobic ammonium oxidation and denitrification.

(NEET-2013)

Solution

(d) : Denitrification is a chemical process in which nitrates in the soil are reduced to molecular nitrogen $(N_2)$ which is released into the atmosphere.It is done by denitrifying bacteria like Pseudomonas denitrificans. Anaerobic oxidation of ammonium $(NH_4)$ also releases nitrogen in the atmosphere.

Standard 12

Biology