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Which one of the following elements is not an essential micronutrient for plant growth?

1. Zn
2. Cu
3. Ca
4. Mn

Correct answer: Ca

Solution

Calcium is an essential plant nutrient, but it is a macronutrient rather than a micronutrient because plants need it in relatively large amounts. Zinc, copper, and manganese are all essential micronutrients.

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