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    Which of the following can fix atmospheric nitrogen?
    Question

    Which of the following can fix atmospheric nitrogen?

    A.

    Anabaena

    B.

    Nostoc

    C.

    Oscillatoria

    D.

    All of the above

    Correct option is D

    Cyanobacteria are autotrophic microbes widely distributed in aquatic and Terrestrial environment many of which can fix atmospheric nitrogen, in paddy field cyanobacteria serves as an important biofertilizer.

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