Stoma Opening Closing

Stoma Opening Closing

Opening and Closing of Stomata 1-Epidermal cell 2-Guard cell 3-Stoma 4-K+ ions 5-Water 6-Vacuole a. Open stoma: stomata are the small pores in the epidermis of leaves. They are bordered by guard cells. The stomata open when the turgor pressure increases in the guard cells, causing the cells to buckle outward. This happens when water flows into the guard cells. Water flows into the guard cells after K+ ions enter the cells, because the water is flowing down its concentration gradient to keep the solute level the same inside the cell as outside. The K+ ions are actively transported into the cells. A proton pump moves H+ ions out of the cell, which is powered by the hydrolysis of ATP. This creates an electrochemical gradient that allows the K+ to flow into the cells through a channel protein....

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UploadedMay 6, 2026

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