Q. Free living, aerobic, non-photosynthetic, nitrogen fixing bacterium is
A) $Azotobacter$
B) $E.coli$
C) $Nostoc$
D) $Salmonella$
Explanation
$Azotobacter$is free-living, aerobic non-photosynthetic nitrogen fixing bacterium. $Nostoc$is free living and symbiotic photosynthetic nitrogen fixing cyanobacteria.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.