Botany A free-living anaerobic bacterium capable of fixing nitrogen is _______

 A free-living anaerobic bacterium capable of fixing nitrogen is _______

  1. A

    Azotobacter
     

  2. B

     Rhizobium
      

  3. C

    Clostridium
     

  4. D

     Streptococcus

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    Solution:

    Concept: Nitrogen-fixing microorganisms are capable of transforming atmospheric nitrogen into fixed nitrogen. 
    Two kinds of nitrogen-fixing bacteria are recognized. 
    The first kind is the free-living (non-symbiotic) bacteria including cyanobacteria and some genera such as Azotobacter, Clostridium, etc. 
    Clostridium includes the genus of anaerobic, gram-positive bacteria. 
    Whereas Azotobacter refers to the genus of aerobic gram-negative nitrogen-fixing bacteria.
    Hence, option 3 is correct.
     

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