SSC General Science & Technology Sample Paper NCERT Sample Paper-7

  • question_answer
    Azollais used as a bio fertilizer, because it

    A)  Has association of my corrhiza

    B)  Has association of nitrogen-fixing Rhizobium

    C)  Has association of nitrogen - fixing cyanobacteria

    D)  Multiplies very fast to produce massive biomass

    Correct Answer: C

    Solution :

    [c] Azolla, a free floating fresh water fern, has symbiotic association with nitrogen fixing cyanobacteria (blue-green alga). It lives in leaf cavities of fern. It has nitrogenase enzyme and can fix nitrogen. The decaying fem releases some nitrogen to rice fields where it grows abundantly and acts as bio fertilizer.

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