Question

Which of the following microbial species are helpful in the denitrification process?
Microbial species:
A. Rhizobium sp
B. Achromobacter
C. Pseudomonas
D. Nitrosomonas
E. Azotobacter
Choose the correct answer from the options given below:

• A. (B) and (C) only
• B. (B), (C), and (D) only
• C. (B), (C), and (E)
• D. (A), (B), and (C) only

Hint:

Denitrification microbes convert nitrates into gaseous nitrogen, playing a critical role in the nitrogen cycle.

Answer 1

The Correct Option is A

Denitrification converts nitrate (NO₃⁻) to nitrogen gas (N₂) or other gaseous forms. Key microbes facilitating this process are:

• Achromobacter (B): A known denitrifying bacterium.
• Pseudomonas (C): Another important denitrifying bacterium.

Conversely, Nitrosomonas (D) participates in nitrification, not denitrification. Rhizobium (A) and Azotobacter (E) are nitrogen-fixing bacteria, distinct from denitrification.