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A nonphotosynthetic aerobic nitrogen fixing soil bacterium is

1. Rhizobium
2. Clostridium
3. Azotobacter
4. Klebsiella

Correct answer: Azotobacter

Solution

Azotobacter is a free-living, nonphotosynthetic, aerobic soil bacterium capable of nitrogen fixation. Rhizobium is symbiotic, Clostridium is anaerobic, and Klebsiella is not the classic soil aerobic nitrogen fixer here.

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