The most active nitrogen-fixing blue-green alga in rice fields is:

  • A
    Anabaena azollae
  • B
    Aulosira fertilissima
  • C
    Cylindrospermum licheniforme
  • D
    Nostoc cycadacearum

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

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Which mineral is essential for the activity of the nitrogenase enzyme in $N_2$ fixation?

The enzyme nitrogenase,present in the root nodules of leguminous plants,catalyzes the conversion of atmospheric nitrogen into which of the following products?

Which enzyme is involved in nitrogen metabolism?

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