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      Question

      The yellowing of older leaves at the base of a plant

      typically indicates a deficiency of which nutrient?
      A Iron Correct Answer Incorrect Answer
      B Zinc Correct Answer Incorrect Answer
      C Phosphorus Correct Answer Incorrect Answer
      D Nitrogen Correct Answer Incorrect Answer
      E Potassium Correct Answer Incorrect Answer

      Solution

      Yellowing of lower leaves, also known as chlorosis, is commonly due to nitrogen deficiency, as nitrogen is a mobile nutrient within the plant and is translocated to new growth when in short supply.

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