NEET Biology question

Not in NEET syllabus

Which two distinct microbial processes are responsible for the release of fixed nitrogen as dinitrogen gas (N2) to the atmosphere? [NEET (Karnataka) 2013]

(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 denitrificationCorrect

Answer: (D)

Solution

Fixed nitrogen is returned to the atmosphere as N2 mainly through denitrification (reduction of nitrate/nitrite to N2 by

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Question ID VK-126887