$Azotobacter$ is a.......

  • A
    Symbiotic nitrogen-fixing bacterium
  • B
    Free-living nitrogen-fixing bacterium
  • C
    Symbiotic nitrogen-fixing cyanobacterium
  • D
    Free-living nitrogen-fixing cyanobacterium

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The chemical fertilizer required for better rhizobial nitrogen fixation is

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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Which mineral element is essential for nitrogen fixation?

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