A free living nitrogen fixing cyanobacterium which can also form symbiotic association with a pteridophyte is

Chlorella

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Nostoc

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Anabaena

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Tolypothrix

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Solution

The correct option is C Anabaena
Nitrogen fixation can be done by either free living organisms or the organisms shows symbiosis. Anabaena is a free living cyanobacterium which can also form a symbiotic association with water fern (a pteridophyte) Azolla. Nostoc (Cyanobacterium) form a symbiotic association with gymnosperm and are present in the corroloid root of Cycas. Thus, the correct answer is option C.

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