During biological nitrogen fixation,which substance protects the enzyme nitrogenase from the harmful effects of oxygen?

  • A
    Cytochrome
  • B
    Leghemoglobin
  • C
    Xanthophyll
  • D
    Carotene

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

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