Which two distinct microbial processes are responsible for the release of fixed nitrogen as dinitrogen gas (N2 ) to the atmosphere?
Correct answer: D. Anaerobic ammonium oxidation and denitrification.
- 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 the root nodules of legumes
- D. Anaerobic ammonium oxidation and denitrification.
Explanation
Denitrification is a chemical process in which nitrates in the soil are reduced to molecular nitrogen (N2 ) which is released into the atmosphere. It is done by denitrifying bacteria like Pseudomonas denitrificans. Anaerobic oxidation of ammonium (NH4 ) also releases nitrogen into the atmosphere.
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