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
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option 3rd is correct answer.
nostoc .
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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
option .c ..is correct .one..
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