What causes the opening of stomata in plants?

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(B) During the day,photosynthesis leads to the production of malic acid,which dissociates into $H^+$ and malate ions.$H^+$ ions are pumped out of the

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Influx of potassium ions

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(B) During the day,photosynthesis leads to the production of malic acid,which dissociates into $H^+$ and malate ions.$H^+$ ions are pumped out of the guard cells,and $K^+$ ions enter the guard cells to form potassium malate.This accumulation of potassium malate increases the osmotic pressure inside the guard cells,causing water to enter by osmosis.As a result,the guard cells become turgid,leading to the opening of the stomata.

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