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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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