Which of the following are free-living nitrog | vedclass

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(D) $1$. $Rhizobium$ is a symbiotic nitrogen-fixing bacterium that lives in the root nodules of leguminous plants.$2$. $Azospirillum$ and $Azotobacter

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Both $B$ and $C$

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(D) $1$. $Rhizobium$ is a symbiotic nitrogen-fixing bacterium that lives in the root nodules of leguminous plants.$2$. $Azospirillum$ and $Azotobacter$ are free-living nitrogen-fixing bacteria found in the soil.$3$. They enrich the nitrogen content of the soil by fixing atmospheric nitrogen.$4$. Therefore,both $Azospirillum$ and $Azotobacter$ are free-living nitrogen-fixing microbes.

Which of the following are free-living nitrogen-fixing microbes?

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