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    Question

    Which of the following element is non-essential but

    useful for plants?
    A Magnesium Correct Answer Incorrect Answer
    B Sodium Correct Answer Incorrect Answer
    C Chlorine Correct Answer Incorrect Answer
    D Copper Correct Answer Incorrect Answer

    Solution

    Accumulation of Na+ at high concentrations in the cytoplasm results in deleterious effects on cell metabolism, e.g., on photosynthetic activity in plants.

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