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

1. Tolypothrix
2. Chlorella
3. Nostoc
4. Anabaena

Correct answer: Anabaena

Solution

Anabaena is a nitrogen-fixing cyanobacterium that can live freely and also form a symbiotic association with Azolla. In this partnership, it helps supply fixed nitrogen to the fern.

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