Which one is used as a bio-fertilizer in padd | vedclass

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(A) $Nostoc$ is a genus of cyanobacteria that is commonly used as a bio-fertilizer in paddy fields.It has the ability to fix atmospheric nitrogen into

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Nostoc

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(A) $Nostoc$ is a genus of cyanobacteria that is commonly used as a bio-fertilizer in paddy fields.It has the ability to fix atmospheric nitrogen into ammonia,which is then utilized by the rice plants for growth.$Azotobacter$ is a free-living nitrogen-fixing bacterium used for various crops but not specifically for paddy.$Rhizobium$ is used for leguminous plants.$Chlorella$ is a green alga used as a food supplement or in wastewater treatment,not as a nitrogen-fixing bio-fertilizer.

Which one is used as a bio-fertilizer in paddy fields?

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