Plants have stomata that allow them to obtain carbon dioxide from the atmosphere.
Carbon dioxide enters the leaf by diffusion. Leaves have a flat, thin shape and internal air spaces to increase the surface area available for diffusion.
Most of the water and mineral ions needed by a plant are absorbed by the root hair cells, which increase the surface area of the roots.
Plants need to let carbon dioxide diffuse into the leaves for photosynthesis.
At the same time the plant is losing water vapour through the stomata and could wilt if the roots are not absorbing water fast enough.
CROSS-SECTION OF A LEAF:
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