For its action,nitrogenase requires

  • A
    high input of energy
  • B
    light
  • C
    $Mn^{2+}$
  • D
    super oxygen radicals

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Name the most crucial enzyme found in root nodules for $N_2$ fixation. Does it require a special pink-coloured pigment for its functioning? Elaborate.

Which of the following is a nitrogen fixer?

Which of the following organisms fixes atmospheric nitrogen in a free-living state?

What is impossible if nitrogenase is inactivated by radiation?

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