alleryStart learning →Which macronutrient is singled out for its role in regulating the opening and closing of stomata?
APotassium (K)
BPhosphorus (P)
CSulfur (S)
DCalcium (Ca)
Answer & Solution
Correct answer: A. Potassium (K)
1. Stomata are the openings for gas exchange and they help maintain a healthy water balance.
2. Potassium is important because of its role in regulating stomatal opening and closing.
3. A potassium ion pump supports that process.
4. Phosphorus builds nucleic acids and phospholipids, and calcium regulates nutrient transport and enzyme function, so neither is the stomatal element.
_Source: OpenStax Biology (1st ed., CC BY 4.0), Ch 31 "Soil and Plant Nutrition", section 31.1 Nutritional Requirements of Plants_
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