BotanyWhich one of the following biogeochemical cycles is a major gaseous reservoir and a major inorganic form which can be used by a small group of bacteria and many cyanobacteria?

Which one of the following biogeochemical cycles is a major gaseous reservoir and a major inorganic form which can be used by a small group of bacteria and many cyanobacteria?

  1. A

    Nitrogen cycle

  2. B

    Phosphorus cycle

  3. C

    Carbon cycle

  4. D

    Sulphur cycle

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    Solution:

    Nitrogen is mainly present in the atmosphere in gaseous form as dinitrogen. It is fixed by prokaryotes such as Rhizobia, Frankia and most of the cyanobacteria as they have the enzyme nitrogenase.

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