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Question
One of the free-living, anaerobic nitrogen-fixer is
One of the free-living, anaerobic nitrogen-fixer is
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Solution
The correct option is C Rhodospirillum
Rhodospirillum is a gram negative purple nonsulfur bacteria generally pink in colour. It is the facultative anaerobe. It is free-living bacteria which helps in nitrogen fixation by converting atmospheric nitrogen into ammonia by virtue of nitrogenase enzyme in the soil. Azotobacter is free living, diazotrophic nitrogen fixer which requires oxygen to grow. Beijerinkia is aerobic nitrogen fixer and they also utilize a range of multicarbon compounds. Rhizobium is a diazotroph which forms symbiotic association with roots of legume plants which is gram-negative aerobic bacteria. Thus, the correct answer is option C.
Rhodospirillum is a gram negative purple nonsulfur bacteria generally pink in colour. It is the facultative anaerobe. It is free-living bacteria which helps in nitrogen fixation by converting atmospheric nitrogen into ammonia by virtue of nitrogenase enzyme in the soil. Azotobacter is free living, diazotrophic nitrogen fixer which requires oxygen to grow. Beijerinkia is aerobic nitrogen fixer and they also utilize a range of multicarbon compounds. Rhizobium is a diazotroph which forms symbiotic association with roots of legume plants which is gram-negative aerobic bacteria. Thus, the correct answer is option C.
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