Which of the following is a micronutrient?

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(D) Essential mineral elements are classified into two categories based on their quantitative requirements: macronutrients and micronutrients.Macronut

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$Ni$

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(D) Essential mineral elements are classified into two categories based on their quantitative requirements: macronutrients and micronutrients.Macronutrients are present in plant tissues in large amounts (generally in excess of $10 	ext{ mmol kg}^{-1}$ of dry matter). Examples include $C, H, O, N, P, S, K, Ca,$ and $Mg$.Micronutrients or trace elements are needed in very small amounts (less than $10 	ext{ mmol kg}^{-1}$ of dry matter). These include $Fe, Mn, Cu, Mo, Zn, B, Cl,$ and $Ni$.Therefore, among the given options, $Ni$ (Nickel) is a micronutrient, while $Ca, Mg,$ and $K$ are macronutrients.

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