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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About Plant Nutrition and Transport
Plants require macronutrients and micronutrients for growth, and mineral deficiencies produce recognizable symptoms. Transport involves water and minerals through xylem by transpiration pull, cohesion and adhesion, while phloem translocates sugars from sources to sinks. Root pressure and transpiration are distinct mechanisms.
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