Question

how do the guard cells regulate opening and closing of stomatal pores

Answer 1

The opening and closing of thestomata is controlled by the guard cells. In light, guard cells take up water by osmosis and become turgid. Because their inner walls are rigid they are pulled apart, opening the pore. In darkness water is lost and the inner walls move together closing the pore

Answer 2

The opening and closing of stomata is regulated by guard cell.

=> The guard cell swell when water flows into them, causing stomatal pore to open.

=> Similarly the pore closes if the guard cell shrink.

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