In paddy fields biological nitrogen fixation is chiefly brought by ______________.

Cyanobacteria

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Green algae

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Mycorrhiza

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Rhizobium

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Solution

The correct option is A Cyanobacteria
Answer is option A i.e. "Cynobacteria"
In paddy fields, non-symbiotic nitrogen fixation occurs. This non-symbiotic biological nitrogen fixation is carried about by Cyanobacteria (Nostoc, Anabaena), Azotobacter, Clostridium and Azospirillum fungi.

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