Which one of the following is not an essential element for plants?

Iron

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Zinc

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Potassium

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Iodine

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Solution

The correct option is D Iodine
Iodine is not an essential element for the plant. No major functions will be harmed in case of deficiency. Hence it is a micronutrient. Whereas iron, zinc and potassium are macronutrients. They are essential for structural, functional and metabolic processes.
So, the correct answer is 'Iodine'.

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Which one of the following is not an essential mineral element for plants while the remaining three are?

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