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

1. Potassium
2. Iron
3. Iodine
4. Zinc

Correct answer: Iodine

Solution

Iodine is not considered an essential element for plants because plants can complete their life cycle without it. Potassium, iron, and zinc are all recognized essential or important micronutrients/macronutrients for plant growth.

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