Question

Given below are two statements:
Statement (I): Nitrobacteria are obligate autotrophic aerobes
Statement (II): Nitrate will not be produced from NH$_4^+$ in the absence of oxygen

• A. Both Statement (I) and Statement (II) are correct
• B. Both Statement (I) and Statement (II) are incorrect
• C. Statement (I) is correct but Statement (II) is incorrect
• D. Statement (I) is incorrect but Statement (II) is correct

Hint:

Nitrifying bacteria like Nitrobacter require oxygen to convert ammonium to nitrate via nitrite.

Answer 1

The Correct Option is A

Nitrobacteria are obligate autotrophic aerobes that oxidize nitrite to nitrate. This nitrification step requires oxygen, so without oxygen, nitrate production from ammonium is halted.