Which of the following organisms is a free-li | vedclass

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(D) The correct answer is $D$. $Nostoc$ is a genus of cyanobacteria that is free-living,aerobic,and capable of photosynthesis. It also possesses speci

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Nostoc

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(D) The correct answer is $D$. $Nostoc$ is a genus of cyanobacteria that is free-living,aerobic,and capable of photosynthesis. It also possesses specialized cells called heterocysts which are the sites of nitrogen fixation. $Rhizobium$ is a symbiotic nitrogen fixer. $Azotobacter$ and $Azospirillum$ are free-living,aerobic nitrogen fixers but they are not photosynthetic.

Which of the following organisms is a free-living,aerobic,photosynthetic nitrogen fixer?

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