Discussion
Under anaerobic condition denitrifying Pseudomonas changes,
Answer: A
Under anaerobic conditions denitrifying Pseudomonas reduces nitrate to molecular nitrogen. The bacteria use nitrate as the electron acceptor in place of oxygen, passing through nitrite and nitrous oxide on the way, and release nitrogen gas to the atmosphere.
Nitrate to ammonia is nitrate ammonification, a different pathway, and nitrate to nitrite is only the first step of the route. Nitrite to nitrate is oxidation by nitrifying bacteria under aerobic conditions, the reverse direction. The answer is option A.
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