Biological Classification And System Of Classification / जैविक वर्गीकरण और वर्गीकरण की प्रणाली
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Biology
Biological Classification And System Of Classification / जैविक वर्गीकरण और वर्गीकरण की प्रणाली
Question Bank
Economic Importance of Bacteria
question_answer
Which of the following is free-living aerobic non- photosynthetic nitrogen fixing bacterium [CBSE PMT 1997; BHU 2003]