The common Nitrogen-fixer in paddy fields is

Frankia

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Rhizobium

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Azospirillum

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Oscillatoria

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Solution

The correct option is C Azospirillum
Azospirillum is a microaerophilic nitrogen fixer commonly found in association with the roots of cereals and grasses of interest. It colonizes the root mass and fixes nitrogen in association with plants.
So, the correct answer is 'Azospirillum'

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