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      Question

      Which of the following nutrients is considered mobile

      within the plant and hence deficiency symptoms appear first on older leaves?
      A Calcium Correct Answer Incorrect Answer
      B Boron Correct Answer Incorrect Answer
      C Magnesium Correct Answer Incorrect Answer
      D Iron Correct Answer Incorrect Answer
      E Sulfur Correct Answer Incorrect Answer

      Solution

      Magnesium is mobile in plants. When deficient, it is translocated to younger tissues, causing chlorosis in older leaves first. In contrast, immobile nutrients like Ca and B show symptoms in young tissues.

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