NEET Sample Paper NEET Sample Test Paper-15

  • question_answer A free living nitrogen-fixing cyanobacterium which can also form symbiotic association with the water fern Azolla is

    A)  Tolypothrix                

    B)  Chlorella

    C)  Nostoc                       

    D)  Anabaena

    Correct Answer: D

    Solution :

    The freshwater fern Azolla harbours Anabaena (a blue green alga) in its leaf cavities. Chlorella is simply a green alga. Nostoc is a free living cyanobacteria involved in fixation and so is Tolypothrix. Hence, the correct option is [d].

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