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FOR WHAT STOMATA EXCHANE GASE

Gas exchange occurs as a result of respiration, when carbon dioxide is excreted and oxygen taken up, and photosynthesis, when oxygen is excreted and carbon dioxide is taken up. In the dark the plant's potassium pumps stop and potassium ions diffuse back out of the guard cells, they lose turgidity and the stomata close. Sufficient oxygen for respiration can still get into the leaf cells by diffusion.

Gas exchange is achieved by diffusion.

With the stomata open, production and consumption of oxygen and carbon dioxide in the leaf is sufficient to maintain a concentration gradient steep enough to facilitate gas exchange with the atmosphere.


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