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DENSITY OF STOMATA AND DESICCATION RATES Since the investigation is to study and experiment with one of the factors that effect the amount of water lost from a leaf, it is important to describe the structure of the leaf. Enlarged portion of leaf The structure of a leaf The function of the leaf is pertinent to its structure. A leaf usually consists of the following parts: - Petiole - the narrow stalk of the leaf attaching it to the stem. Lamina - the photosynthetic part of the leaf. Mid-rib and veins - consist of many tiny tubes which convey water into the leaf and carry food from it Epidermis - the outermost layer of cells of a plant. This layer is one cell thick. Waxy cuticle - covers the epidermis and reduces water loss. The lower epidermis consists mainly of stomata. Stomata are pores, which lead to an extensive system of air spaces between the cells of...

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