Question

Denitrification is the _______________.

• A. Reduction of NO${}_2$ to ammonia by bacteria in the soil
• B. Conversion of ammonia to amino acids
• C. Conversion of ammonia and nitrates to gaseous nitrogen
• D. Oxidation of ammonia to nitrate

Answer 1

The correct option is C Conversion of ammonia and nitrates to gaseous nitrogen

Denitrification is the process of conversion of nitrates and ammonia into nitrogen gas, which is returned back to the atmosphere. This is caused by bacteria and they obtain their energy by this process. A small amount is converted to usable forms by lightning in a process called atmospheric nitrogen fixation.

Therefore, the correct answer is option C.