According to the potassium pump theory of Levitt,which of the following statements is correct?

  • A
    Starch is incompletely oxidized to $PEP$ during night.
  • B
    Malic acid dissociates into malate ion and protons in the subsidiary cells.
  • C
    Movement of $H^+$ ions from guard cell to subsidiary cell is active.
  • D
    Potassium malate decreases the $OP$ of guard cells during day.

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