According to potassium pump theory of Lewitt

Starch is incompletely oxidized to PEP during night

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Malic acid dissociates into malate ion and protons in the subsidiary cells

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Movement of H⁺ ions from guard cell to subsidiary cell is active

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Potassium malate decreases the OP of guard cells during day

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Solution

The correct option is C Movement of H⁺ ions from guard cell to subsidiary cell is active
According to potassium pump theory of Lewitt,
Starch is incompletely oxidized to PEP during the day.
Malic acid dissociates into malate ion and proton in the guard cells.
Movement of H⁺ ions from guard cell to subsidiary cell is active because it uses ATP.
Potassium malate increases the OP of guard cells during the day.

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1.	Epidermal cell	Subsidiary cell	Stomatal aperture	Guard cell
2.	Subsidiary cell	Epidermal cell	Guard cell	Stomatal aperture
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