Question

Denitrification is caused by

• A. Pseudomonas
• B. Nitrobacter
• C. Nitrosomonas
• D. Azotobacter

Answer 1

The correct option is A Pseudomonas

Denitrification is the process of degradation of fixed nitrogenous compounds to free nitrogen which is released back to the atmosphere. It is performed by several bacteria like Pseudomonas which utilize nitrate to form nitrite in a process called reduction. Nitrite is further reduced to nitric oxide then to nitrous oxide and then nitrogen gas. This process reduces the fertility and ultimately the agricultural productivity decreases.

Thus, the correct answer is option A.