Which of the following are free-living nitrog | vedclass

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(D) The correct answer is $D$. $Azospirillum$ and $Azotobacter$ are well-known examples of free-living nitrogen-fixing bacteria found in the soil. $Rh

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Azospirillum,Azotobacter

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(D) The correct answer is $D$. $Azospirillum$ and $Azotobacter$ are well-known examples of free-living nitrogen-fixing bacteria found in the soil. $Rhizobium$ is a symbiotic nitrogen-fixing bacterium. $Nostoc$ and $Anabaena$ are cyanobacteria that can fix nitrogen,but they are often associated with symbiotic relationships (e.g.,in $Azolla$ or $Cycas$ roots) or exist in colonies,whereas $Azospirillum$ and $Azotobacter$ are specifically classified as free-living soil bacteria.

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

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Choose the incorrect pair$(s)$:
$(I)$ Free-living nitrogen-fixing aerobic microbes - Beijerinckia
$(II)$ Rhodospirillum - Aerobic microbes
$(III)$ Bacillus - Free-living
$(IV)$ Cyanobacteria - Anabaena and Azotobacter

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