Which of the following bacteria are free-livi | vedclass

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(B) Bacteria that fix atmospheric nitrogen while living freely in the soil are known as free-living nitrogen-fixing bacteria.$Azospirillum$ and $Azoto

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$(ii)$ and $(iii)$

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(B) Bacteria that fix atmospheric nitrogen while living freely in the soil are known as free-living nitrogen-fixing bacteria.$Azospirillum$ and $Azotobacter$ are well-known examples of free-living nitrogen-fixing bacteria.$Pseudomonas$ is generally involved in denitrification,and $Nostoc$ is a cyanobacterium that can be free-living or symbiotic,but in the context of standard textbook classifications for free-living nitrogen fixers,$Azospirillum$ and $Azotobacter$ are the primary examples provided.Therefore,the correct pair is $(ii)$ and $(iii)$.

Which of the following bacteria are free-living nitrogen fixers?
$(i)$ $Pseudomonas$ $(ii)$ $Azospirillum$
$(iii)$ $Azotobacter$ $(iv)$ $Nostoc$

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Which of the following bacteria are free-living nitrogen fixers?$(i)$ $Pseudomonas$ $(ii)$ $Azospirillum$$(iii)$ $Azotobacter$ $(iv)$ $Nostoc$