Question

Denitrification reduces nitrate to nitrogen gas under

• A. Aerobic conditions
• B. Strictly aerobic only
• C. Anoxic conditions with organic carbon
• D. High oxygen only

Hint:

Denitrification: \[ \boxed{ NO_3^- \rightarrow NO_2^- \rightarrow NO \rightarrow N_2O \rightarrow N_2 } \] Occurs under \[ \boxed{\text{Anoxic conditions + Organic carbon}} \]

Answer 1

The Correct Option is C

Denitrification is the biological reduction of nitrate \((NO_3^-)\) to nitrogen gas \((N_2)\) by facultative anaerobic bacteria. It occurs under anoxic conditions where oxygen is absent and organic carbon serves as the electron donor. Hence, \[ \boxed{\text{Anoxic conditions with organic carbon}} \] is the correct answer. Therefore, \[ \boxed{(C)} \]