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

  • A
    Rhizobium,Azotobacter
  • B
    Pseudomonas,Chlamydomonas
  • C
    Nostoc,Anabaena
  • D
    Azospirillum,Azotobacter

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Categorize the following nitrogen-fixing microorganisms into symbiotic and free-living types:
$I-$ Rhizobium
$II-$ Azotobacter
$III-$ Beijerinckia
$IV-$ Rhodospirillum
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$VI-$ Bacillus
$VII-$ Anabaena (free-living)
$VIII-$ Nostoc (symbiotic)
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