Which of the following organisms fixes atmosp | vedclass

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(D) Nitrogen fixation is the process of converting atmospheric nitrogen into ammonia,which can be utilized by plants. Many bacteria are capable of fix

Vedclass · Accepted Answer

Both $(A)$ and $(B)$

Vedclass · Answer

(D) Nitrogen fixation is the process of converting atmospheric nitrogen into ammonia,which can be utilized by plants. Many bacteria are capable of fixing atmospheric nitrogen. $Azospirillum$ and $Azotobacter$ are well-known examples of free-living nitrogen-fixing bacteria found in the soil. $Nostoc$ is a cyanobacterium that can fix nitrogen,but it is often found in symbiotic associations (e.g.,in $Anthoceros$ or $Cycas$ roots) or in colonies,though it can also be free-living. However,since both $Azospirillum$ and $Azotobacter$ are classic examples of free-living nitrogen fixers,the most appropriate answer is that both $(A)$ and $(B)$ are correct.

Which of the following organisms fixes atmospheric nitrogen in a free-living state?

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