Question

Nitrogen is returned back to the atmosphere in the nitrogen cycle by the process of________.

• A. Nitrification
• B. Denitrification
• C. Nitrogen fixation
• D. Ammonification

Answer 1

The correct option is B Denitrification

Denitrification is the microbial process of reducing nitrate and nitrite to gaseous forms of nitrogen, principally nitrous oxide $\left(N_{2}O\right)$ and nitrogen $\left(N_2\right)$. A large range of microorganisms like Pseudomonas denitrificans can denitrify.