Q. A free living nitrogen fixing cyanobacterium which can also form symbiotic association with the water fern$Azolla$ is
A) $Tolypothrix$
B) $Chlorella$
C) $Nostoc$
D) $Anabaena$
Explanation
$Anabaena$ is a free-living nitrogen fixing cyanobacterium which can form symbiotic association with water fern$Azolla$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.