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      Question

      In organic farming, which of the following is used as a biological nitrogen source?

      A Urea Correct Answer Incorrect Answer
      B Ammonium nitrate Correct Answer Incorrect Answer
      C Farmyard manure Correct Answer Incorrect Answer
      D Anhydrous ammonia Correct Answer Incorrect Answer

      Solution

      Organic farming avoids synthetic nitrogen sources and uses compost, FYM, and green manures to supply nitrogen.

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