Q. The common nitrogen-fixer in paddy fields is
A) $Rhizobium$
B) $Azospirillum$
C) $Oscillatoria$
D) $Frankia$
Explanation
$Azospirillum$is a nitrogen fixing bacterium for paddy fields. It is very useful soil and root bacterium. It is an associative symbiotic $N_{2}$fixing bacteria.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.