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Q: Why substances pass in and out of stomata?
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Can H2O pass through stomata?

Yes most gases do.


When substances pass through diffusion they move from areas of their what to areas of their what?

it moves from high to low concentration


How stomata reacts with water?

When light hits the stomata it activates photosynthetic K+ pumps. These cells pump potassium ions into the guards cell around the stomata. Water is attracted to the potassium ions and thus enters the guards cells. This causes the guard cells to swell, but the rigidity of the one side causes that side to bow inwards, this creates an opening for gases to exchange in the leaf. This opening is the stomata. When water is not present, the stomata will not open.


What is the importance of osmosis?

Osmosis, in botany and chemistry, is the process by which some unwanted elements or molecules in a solution are blocked by a membrane that other substances are allowed to pass through.


How does CO2 get into a leaf?

Through the stomata, openings in the leaf surface. By diffusion. There are three photosynthesis processes, C3, C4, and CAM. (These names describe part of the chemistry.) The desert plants (and some epiphytes) use CAM, for in this process, the stomata are closed during the day, and open at night. The plant absorbs CO2 into its system as a complex chemical (the CAM bit) over night, and during the day, the stomata close and the plant converts the CAM chemical into CO2 to be used for photosynthesis in the usual way. Normal plants open their stomata during the day, and CO2 diffuses in and O2 out.