Which of the following bacteria are free-livi | vedclass

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(D) Nitrogen-fixing bacteria can be symbiotic or free-living.$Rhizobium$ is a symbiotic nitrogen-fixing bacterium that lives in the root nodules of le

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Both $A$ and $B$

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(D) Nitrogen-fixing bacteria can be symbiotic or free-living.$Rhizobium$ is a symbiotic nitrogen-fixing bacterium that lives in the root nodules of leguminous plants.$Azospirillum$ and $Azotobacter$ are examples of free-living nitrogen-fixing bacteria found in the soil.Therefore,both $Azospirillum$ and $Azotobacter$ are free-living nitrogen fixers.

Which of the following bacteria are free-living nitrogen fixers?

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