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The role of calcium in a plant is described as twofold. Which pair is correct?
ARegulating nutrient transport and supporting enzymes
BRegulating stomatal aperture and supporting enzymes
CRegulating nutrient transport and building cell walls
DRegulating stomatal aperture and building cell walls
Answer & Solution
Correct answer: A. Regulating nutrient transport and supporting enzymes
1. Calcium is a macronutrient with two stated roles.
2. It regulates nutrient transport.
3. It supports many enzyme functions.
4. Regulation of stomatal opening and closing is credited to potassium, not calcium, so options naming it borrow the wrong element.
5. Calcium along with magnesium and the micronutrients also contributes to the ionic balance of the plant.
_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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