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

1. Iron
2. Manganese
3. Cadmium
4. Phosphorus

Correct answer: Cadmium

Solution

Cadmium is not an essential mineral element for plants; it is generally toxic even at low concentrations. Iron, manganese, and phosphorus are all essential because plants need them for processes like chlorophyll function, enzyme activity, and energy transfer.

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