The cuticle helps retain water inside the leaf cells. The outermost layer of the leaf is the epidermis. Function of the waxy cuticle: prevents loss of water 11. Give "one word names" for the processes by which these raw materials move across the leaf, as seen in the diagram. Leaf Structure and Function. Why are epidermal cells transparent? During the day these cells produce sugar by photosynthesis, causing their walls to curve inward and away from each other and creating a space between the cells called a … After reading this article you will learn about: 1. c) Structure and strength so leaf is lifted up toward the light Internal structure of a leaf margin guard cells Stoma [plural: stomata] palisade layer spongy layer xylem phloem 9. Epidermis: It is the outermost layer and secretes a waxy substance called the cuticle. Spongy Cells: Although theses cells are not at the top of the leaf (they are in the middle) they still do photosynthesis. Parts of a Plant Cell. 33)Knowledge of Plant Cells a) Water storage? Structure and Components of a Human Cell. Key Concepts The External Structure of a Leaf The typical leaf consists of a flat lamina (leaf blade) at is attached to the stem by means of a petiole The veins of the leaf blade consist of … The plant cell has many different features that allow it to carry out its functions. All leaf cells must have direct cell-to-cell contact with the vascular tissues to receive water and dissolved minerals and to export manufactured sugars. Leaf: Definition, Characteristics and Functions (With Diagram Botanists call the upper side the adaxial surface (or adaxis) and the lower side the abaxial surface (or abaxis). By means of labelled arrows drawn on the diagram above, show the pathway taken by each of the two raw materials to a cell in the centre of the leaf. a) Large Vacuole b) Sugar destination? Cell is a compartment where all the activities of life takes place. Each of these structures, called organelles, carry out a specialized role. Pairs of these cells containing chloroplasts are found on the lower epidermis of the leaf and are responsible for forming stomates. It consists of the upper and lower epidermis, which are present on either side of the leaf. Show with another labelled arrow the direction the energy comes from. to allow a lot of light to pas through 12. Consider how the leaf is adapted to photosynthesis, gaseous exchange and transport. Structure of a leaf (Source: Wikipedia) Each leaf consists of the following layers. Comparison of Prokaryotic Cells and Eukaryotic Cells and 2. Let us make an in-depth study of the structure and functions of cell. A diagram of a plant cell with the organelles labeled. 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