Question
Describe the mechanism of stomatal opening.
Answer :
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Stomatal opening is a physiological process regulated primarily by the turgor pressure of guard cells, which control the size of the stomatal pore. The mechanism begins with the perception of external and internal stimuli such as light, low carbon dioxide concentration, and circadian rhythms. Light, especially blue light, activates proton pumps (H⁺-ATPases) in the plasma membrane of guard cells, causing active transport of H⁺ ions out of the cells. This creates an electrochemical gradient across the
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