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      Question

      Rice plants have a specific preference for the form of

      nitrogen they uptake. Which form is most efficiently absorbed by rice under submerged conditions, and why is it preferred?
      A Nitrate form (NO₃⁻), due to its high solubility Correct Answer Incorrect Answer
      B Ammonical form (NH₄⁺), because it is more stable in anaerobic soils Correct Answer Incorrect Answer
      C Urea form (CO(NH₂)₂), for its slow-release properties Correct Answer Incorrect Answer
      D Nitrite form (NO₂⁻), due to its rapid absorption Correct Answer Incorrect Answer
      E Elemental nitrogen, for direct assimilation by roots Correct Answer Incorrect Answer

      Solution

      Rice absorbs nitrogen more efficiently in the ammonical form (NH₄⁺) under submerged conditions, as it remains stable and readily available in anaerobic environments.

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