Stomata open in the daytime due to

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(D) During the daytime,light triggers the process of photosynthesis in guard cells,which leads to the production of organic acids (like malate) and th

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(D) During the daytime,light triggers the process of photosynthesis in guard cells,which leads to the production of organic acids (like malate) and the accumulation of potassium ions $(K^+)$.This accumulation of solutes lowers the water potential inside the guard cells.As a result,water enters the guard cells from the surrounding subsidiary cells via osmosis.The increase in turgor pressure causes the guard cells to swell and the stomatal pore to open.

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