GASEOUS EXCHANGE

Water evaporates from the xylem in the leaf into the air pockets between the cells (100% relative humidity ) then diffuse out from the stomata in the epidermis of the leaf, into the outside air which is at a lower relative humidity (propagation). This movement produces transpirational pull Gases such as oxygen/carbon dioxide entering and leaving the plant via stomata of leaves or lenticels on stems. `

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