All of the following are macronutrient except
Correct answer: A. Cu ions
- A. Cu ions
- B. Ca ions
- C. Mg ions
- D. K ions
Explanation
The correct answer is Cu ions. Macronutrients are elements required in large quantities for plant growth. Copper, calcium, magnesium, and potassium are all essential nutrients for plants, but copper is classified as a micronutrient, not a macronutrient. The other options, Ca ions, Mg ions, and K ions, are all macronutrients.
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