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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Which specific enzyme is present in the heterocysts of blue-green algae?

Nitrogen fixation is shown by prokaryotes and not eukaryotes. Comment.

Which of the following are free-living nitrogen-fixing microbes?

The important contribution of molybdenum is in:

Bacteria which directly convert atmospheric nitrogen into nitrogen compounds are called:

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