Question

The common nitrogen-fixer in paddy fields is?

• A. Rhizobium
• B. Oscillatoria
• C. Azospirillum
• D. Frankia

Answer 1

The correct option is C

Azospirillum

The correct option is C.

Explanation for the correct option:

1. Azospirillum is the commonly found nitrogen fixing bacterial genus, particularly in paddy field.
2. Azospirillum is a Gram-negative, microaerophilic, nitrogen-fixing bacterial genus belonging to the Rhodospirillaceae family.
3. Plant growth can be aided by Azospirillum bacteria.

Final answer: The common nitrogen-fixer in paddy fields is Azospirillum.