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    Question

    The blue green alga Anabaena lives in the leaves of

    Azolla, a freshwater fern, forming which of the following relationships?
    A Autotrophic Correct Answer Incorrect Answer
    B Symbiotic Correct Answer Incorrect Answer
    C Parasitic Correct Answer Incorrect Answer
    D Saprophytic Correct Answer Incorrect Answer

    Solution

    The blue-green alga Anabaena lives in the leaves of Azolla, a freshwater fern, forming a symbiotic relationship. In this relationship, Anabaena provides nitrogen to Azolla through nitrogen fixation, while Azolla offers a protected environment and nutrients to the alga. This mutualistic association benefits both organisms and is particularly significant in rice cultivation, where Azolla is used as a natural fertilizer.

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