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If you take a cross-section of a leaf and magnify it several times, you will see tiny pores on the underside. These holes are called stomata, and gaseous transfer takes place here, with carbon dioxide and oxygen entering and circulating inside the leaf. Waste gases from photosynthesis and respiration leave through the stomata as well. The oxygen diffuses out of the leaf because the concentration of oxygen is greater outside rather than inside the leaf (diffusion is the random movement of particles from an area of high concentration to an area of low concentration), down the concentration gradient. Likewise, the carbon dioxide diffuses into the cell because the concentration of carbon dioxide is greater outside the leaf than inside.

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13y ago
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13y ago

Stomata on the underside of the leaves.

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Q: How do CO2 and O2 move in and out of a plant leaf?
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