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Which is a free-living aerobic nitrogen fixing microbe?

AAcetobacter
BAcidobacter
CAzotobacter
DAzospirillum
Answer & Solution
Correct answer: C. Azotobacter
1. It works without a host plant. 2. Beijerinckia is named alongside it. 3. It is Azotobacter. _Source: syllabus Biology, Ch 12 'Mineral Nutrition'_
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