(C) $Mn$ stands for manganese. Microelements (or trace elements) are required by plants in very small amounts (less than $10 \text{ mmol kg}^{-1}$ of

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(C) $Mn$ stands for manganese. Microelements (or trace elements) are required by plants in very small amounts (less than $10 \text{ mmol kg}^{-1}$ of dry matter). $Ca$ (calcium), $Mg$ (magnesium), and $S$ (sulfur) are macronutrients, whereas $Mn$ (manganese) is a micronutrient.