A free living nitrogen-fixing cyanobacterium which can also form symbiotic association with water fern Azolla is

Anabaena

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Tolypothrix

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Chlorella

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Rhizobium

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Solution

The correct option is A Anabaena
Anabaena belongs to the family of filamentous cyanobacteria that is known for its nitrogen fixing ability. While these exists as a plankton, it is known to form symbiotic relationships with the water fern Azolla and are found growing together at the surface of streams and ponds on temperate and tropical regions.
Therefore, the correct answer is option A.

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