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Title
Cross section of leaf with palisade mesophyll cells #241644688
Description
The outermost layer of the leaf is the epidermis. It consists of the upper and lower epidermis. The epidermis aids in the regulation of gas exchange. It contains stomata, which are openings through which the exchange of gases takes place. Two guard cells surround each stoma, regulating its opening and closing. Guard cells are the only epidermal cells to contain chloroplasts.