Azolla has a symbiotic association with

Rhizobium

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Anabaena

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Nostoc

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Azospirillum

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Solution

The correct option is B Anabaena
Anabeana and Rhizobium fix atmospheric nitrogen as a symbiotic association with plants. Azolla is a pteridophytic fern which symbiotically asscociates with a cyanobacterium called anabaena and leguminous plants associate with Rhizobium which fixes atmospheric nitrogen. Nostoc and Azospirillium are a free living cyanobacterium which also sequester atmospheric nitrogen.

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