Principal 'N' fixing algal community of blue-green algae?

A. Rhizobium

B. Anabaena

C. Azotobactor

D. Azospirillum

Answer: Option B

Solution(By Examveda Team)

Anabena is the principal nitrogen-fixing algal community of blue-green algae. It is found as plankton in shallow water and on moist soil as beadlike or barrel cells and interspersed with enlarged spores.
They form symbiotic relationships with certain plants, such as mosquito fern.