Which of the following is a free-living,aerobic,and non-photosynthetic nitrogen-fixing bacterium?

  • A
    Rhizobium
  • B
    Nostoc
  • C
    Azospirillum
  • D
    Azotobacter

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$A-$ The microbe $Frankia$ produces nitrogen-fixing nodules on the roots of non-leguminous plants.
$R-$ Both $Rhizobium$ and $Frankia$ are free-living in soil,but as symbionts,can fix atmospheric nitrogen.

Free-living nitrogen-fixing aerobic microbes are ...... and .......

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Identify the process represented by the following reaction:
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