'X' is an essential micronutrient required in leaves and roots. The major function of 'X' is to perform the metabolism of urea and ureids and its deficiency causes leaf tip necrosis. X is:

Sulphur

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Magnesium

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Zinc

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Nickel

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Solution

The correct option is D Nickel
Nickel is a micronutrient. It is absorbed by the plant from the soil as a divalent ion. It is a component of two enzymes, urease and hydrogenase. It is involved in the metabolism of urea. Its deficiency cause chlorosis, necrosis and stunted plant growth.
So the correct answer is 'NIckel'.

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