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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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