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Microbes in Human Welfare

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Advanced Botany

Plant Growth and Development
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Microbes in Human Welfare
Strategies for Enhancement in Food Production
Molecular Basis of Inheritance
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Biological Classification
  1. A nonphotosynthetic aerobic nitrogen fixing soil bacterium is
    1. Rhizobium
    2. Clostridium
    3. Azotobacter
    4. Klebsiella
Correct Option: C

Azotobacter is a free living soil bacterium able to take up dinitrogen from the soil and fix it into organic nitrogenous material like aminoacid. Clostridium is anaerobic free living soil N2 fixing bacteria. Rhizobium is symbiotic N2 fixing bacteria.


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