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As the concentration of potassium inside guard cells increases, water enters the cell by osmosis. But why does the swollen causes the stoma to open? Does it relate to the thickness of the cell wall? If so, how?

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  • $\begingroup$ Welcome to Biology.SE! We encourage you to do some research on your own and then, informed by what you have learned, ask any questions you still have (ideally with references to reliable sources). For this question, you can find answers easily from reliable sources and so this question fits the criteria for "homework". We also expect you to search for answers on this site before posting! ——— Please take the tour and then go through the help pages starting with How to Ask questions effectively on this site. Thanks! 😊 $\endgroup$ – tyersome Feb 11 at 21:24
  • $\begingroup$ @tyersome, thank you for telling me that. However I have tried to do some research on it and I know how the concentration of potassium ions affects the cell's water potential which makes them swell or shrink.But my question is how swollen change the shape of cells and therefore open the stomata---why don't cells come more closely when swelling as they have larger volumes? ( and unfortunately I can't find the answers on the internet.) $\endgroup$ – Emily Feb 12 at 13:42
  • $\begingroup$ Sorry I should have looked at that page closer, you are correct it doesn't actually answer your question. This site seems to have a reasonably clear explanation, though it doesn't address all types of stomata. Does that help? $\endgroup$ – tyersome Feb 12 at 14:43

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