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Name two free living microorganisms whic...

Name two free living microorganisms which can fix nitrogen. Also write the name of the water ferm and a gymnosperm with whom some cyanobacteria have symbiotic association.

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(i) Cyanobacteria, (ii) Photosynthetic bacteria.
Cyanobacteria have symbiotic relation with the following : (i) A water fern : found of Azolla.
(ii) Gymnosperm : roots of Cycas.
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