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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: NCERT Class 11 Biology, Ch 12 'Mineral Nutrition'_
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