Select the incorrect statement with respect to the biological nitrogen fixation by Rhizobium.

  • A
    Nitrogenase may require oxygen for its functioning.
  • B
    Nitrogenase is a $Mo-Fe$ protein.
  • C
    Leg-haemoglobin is a pink-coloured pigment.
  • D
    Nitrogenase helps to convert $N_2$ gas into two molecules of ammonia.

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