Reduction of NO2 to ammonia by bacteria in the soil
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B
Conversion of ammonia to amino acids
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C
Conversion of ammonia and nitrates to gaseous nitrogen
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D
Oxidation of ammonia to nitrate
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Solution
The correct option is C Conversion of ammonia and nitrates to gaseous nitrogen
Denitrification reduces nitrates and nitrites to nitrogen gas, thus replenishing the atmosphere. These are mainly caused by the anaerobic action of pseudomonas and clostridium bacteria. So, the correct answer is option C.