A) outward movement of malate
B) inward movement of potassium ions
C) outward movement of protons
D) inward movement of chloride
Correct Answer: C
Solution :
Ion movements into and out of the guard cells during stomatal closure and opening depend on proton pumping of ATPase, which provides the proton gradients that are coupled to other secondary active transport mechanisms for K+ and Cl-. The outward movement of protons is directly involves the expenditure of energy.
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