The macronutrient, ___is important for the opening and closing of stomata.
A
manganese
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B
magnesium
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C
iron
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D
potassium
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Solution
The correct option is D potassium The turgidity of guard cells is due to the accumulation of K+ (potassium ions) in the guard cells. As K+ levels increase in the guard cells, the water potential of the guard cells drops, and water enters the guard cells.