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  3. Railways

Railways Sample Paper RRBs Assistant Loco Pilot and Technician CBT STAGE-I Sample Paper-18

  • question_answer
    Materials of biological origin which are commonly used to maintain and improve soil fertility are

    A)  green manure

    B)  bio fertilizers

    C)  bio insecticides

    D)  Both [A] and [B]

    Correct Answer: D

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