Which of the following are free-living nitrogen-fixing microbes?

  • A
    Rhizobium
  • B
    Azospirillum
  • C
    Azotobacter
  • D
    Both $B$ and $C$

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Categorize the following nitrogen-fixing microorganisms into symbiotic and free-living types:
$I-$ Rhizobium
$II-$ Azotobacter
$III-$ Beijerinckia
$IV-$ Rhodospirillum
$V-$ Frankia
$VI-$ Bacillus
$VII-$ Anabaena (free-living)
$VIII-$ Nostoc (symbiotic)
Select the correct grouping for (Symbiotic) and (Free-living) respectively.

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