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    Which element was added as an essential nutrient in the year 1987?
    Question

    Which element was added as an essential nutrient in the year 1987?

    A.

    Cadmium

    B.

    Chromium

    C.

    Iron

    D.

    Nickel

    E.

    Answer not known

    Correct option is D

    Essential nutrients are identified based on physiological necessity.
    Nickel was recognized as an essential micronutrient in 1987.
    It is required for urease enzyme activity in plants.
    Nickel deficiency affects nitrogen metabolism.
    Thus, Nickel fulfills the criteria of essentiality.
    Therefore, option (d) is correct.

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