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Question
Which of the following is a free living nitrogen fixing bacteria present in soil?
Options
Azotobacter
Nitrosomonas
Rhizobium
Pseudomonas
MCQ
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Solution
Azotobacter
Explanation:
Azotobacter is a free-living aerobic nitrogen-fixing bacterium found in soil. Rhizobium is symbiotic, Nitrosomonas carries out nitrification, and Pseudomonas is involved in denitrification.
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