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  4. A free living nitrogen-fixing cyanobacterium, which can also form symbiotic association with a pteridophyte

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Q. A free living nitrogen-fixing cyanobacterium, which can also form symbiotic association with a pteridophyte

ManipalManipal 2014

Solution:

Anabaena is a free living cyanobacterium which can also form symbiotic association with water form (a pteridophyte) Azolla. Nostoc (cyanobacterium) form symbiotic association with gymnosperm and are present in corroloid root of Cycas.