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NEET AIPMT SOLVED PAPER 2000

  • question_answer
                    A water fem which is used as a green manure in rice fields is:

    A)                                                                         Salvinia 

    B)                 Mucor  

    C)                 Aspergillus

    D)                 Azolla

    Correct Answer: D

    Solution :

                    Singh (1977) has reported the use of Azolla as a precious green compost for rice cultivation. The leaves of   Azolla (water fern) contain upto 80, 000 Anabaena which fix atmospheric nitrogen and make it available to Azolla which, in turn, makes it available to soil on decomposition.


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