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9th Class Science Natural resources Question Bank Natural Resources

  • question_answer
    Which of the following materials of biological origin are commonly used to maintain and improve soil fertility?

    A) Green manure   

    B) Biofertilisers

    C) Bioinsecticides   

    D) Both [a] and [b]  

    Correct Answer: D

    Solution :

    Green manure and biofertilisers maintain and improve soil fertility.


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