Question

How do guard cells regulate the opening and closing of stomatal pores?

Answer 1

The opening and closing of the stomata 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.
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Answer 2

the opening and closing of stomata is controlled by the guard cells . in light, guard cells take up water by osmosis and become turgid . becoz there 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.