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Microbes in Human Welfare

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Advanced Botany

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Biological Classification
  1. Non-symbiotic nitrogen fixers are
    1. Azotobacter
    2. Pseudomonas
    3. soil fungi
    4. blue-green algae
Correct Option: A

Azotobacter are nonsymbiotic, free living nitrogen fixing bacteria. (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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