Choose the incorrect pair$(s)$:
$(I)$ Free-living nitrogen-fixing aerobic microbes - Beijerinckia
$(II)$ Rhodospirillum - Aerobic microbes
$(III)$ Bacillus - Free-living
$(IV)$ Cyanobacteria - Anabaena and Azotobacter

  • A
    $I, II$
  • B
    $II, III$
  • C
    $I, III$
  • D
    $II, IV$

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Complete the given reaction:
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The given equation refers to:
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