1.

A free-living nitrogen-fixing cyanobacterium which can also form symbiotic association with the water fern Azolla is :A. NostocB. TolypothrixC. ChlorellaD. Anabaena

Answer» Correct Answer - D
Anabaena maintains a mutually beneficial symbiotic relationship with the water fern Azolla, which provides the cyanobacteria with a safe environment in exchange for nitrogen.


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