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(B) $Azotobacter$ is a well-known genus of free-living soil bacteria.It is capable of fixing atmospheric nitrogen into ammonia,which can be utilized b

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Free-living nitrogen-fixing bacterium

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(B) $Azotobacter$ is a well-known genus of free-living soil bacteria.It is capable of fixing atmospheric nitrogen into ammonia,which can be utilized by plants.Unlike $Rhizobium$,which is symbiotic,$Azotobacter$ lives independently in the soil.It is not a cyanobacterium,as it does not perform oxygenic photosynthesis like $Anabaena$ or $Nostoc$.Therefore,the correct classification is a free-living nitrogen-fixing bacterium.

$Azotobacter$ is a.......

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