Which of the following nutrient play the most effective role in controlling rate of transpiration:
Correct answer: C. Potassium
- A. Phosphorus
- B. Zinc
- C. Potassium
- D. Mg
Explanation
Potassium regulates stomatal opening and closing, so it strongly controls the rate at which plants lose water through transpiration. Zinc, phosphorus and magnesium have important functions, but they do not regulate stomatal movement as directly.
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