- Know the parts of a leaf and their function: waxy cuticle, stoma, guard cells, mesophyll cells (2 types), bundle sheath cells, vascular bundle. The outer surface of the leaf has a thin waxy covering called the cuticle (A), this layer's primary function is to prevent water loss within the leaf. Leaf Structure and Function. The cuticle is like human skin, it protects the lead from sunburn (too much sund The cuticle functions to keep leaves green because they have all the chlorophyll a and b. MEMORY METER. These cells are located close to the leaf surface to maximise light absorption. The outermost layer of the leaf is the epidermis. The primary function of the plant cuticle is as a water permeability barrier that prevents evaporation of water from the epidermal surface, and also prevents external water and solutes from entering the tissues. The epidermis aids in the regulation of gas exchange. A single layer of clear cells that contains stomates and guard cells. Functions. Describes how leaves are made of several different kinds of specialized tissues. Here, the cuticle has also been shown to … decrease transpiration rate. The cuticle prevents the evaporation of water from the leaf surface. Botanists call the upper side the adaxial surface (or adaxis) and the lower side the abaxial surface (or abaxis). Stomata. (Plants that leave entirely within water do not have a cuticle). Waxy cuticle. Cuticle. It is a waxy layer and does not comprise of live cells. A thin, waxy layer that covers the upper epidermis of the leaf, preventing the loss of water. Remember that the top of the leaf has the protective coating of the cuticle and then a layer of cells known as the upper epidermis. '''Upper Epidermis''': A protective layer of cells that produces the cuticle. The plant cuticle is an extracellular hydrophobic layer that covers the aerial epidermis of all land plants, providing protection against desiccation and external environmental stresses. % Progress . It's function is to prevent the leaf from desiccation (drying out). Describes the structure and function of leaves. Click Create Assignment to assign this modality to your LMS. The leaf of plants in shaded habit has very thin cuticle. Directly underneath the cuticle is a layer of cells called the epidermis (B). The past decade has seen considerable progress in assembling models for the biosynthesis of its two major components, the polymer cutin and cuticular waxes. Lower epidermis layer. For instance, as compared to the rest of a leaf, the cuticle of guard cells is more permeable to water vapor which in turn influences their activities/functions. The upper epidermis has a thick cuticle layer but … It consists of the upper and lower epidermis, which are present on either side of the leaf. '''Palisade Mesophyll''': Rod shaped cells that contain large numbers of chloroplasts for photosynthesis. Cuticle of leaf under microscope Photo Tyanna. 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