Functions 7. Photosynthesis occurs primarily in the mesophyll, which is the middle layer of a leaf. Importance. In addition to their role as the digestive component and organelle-recycling facility of animal cells, lysosomes are considered to be parts of the endomembrane system. Definition of Leaf 2. The whole leaf looks green to us, but most of the cells and cell material are colorless or clear. Definition of Leaf: Leaf is a green, dissimilar exogenous lateral flattened outgrowth which is borne on the node of a stem or its branch and is specialised to perform photosynthesis. The green color comes from the chlorphyll molecules in the chloroplasts. Lysosomes also use their hydrolytic enzymes to destroy pathogens (disease-causing organisms) that might enter the cell. Modification 6. A leaf cell is a plant cell. protect the leaf against h20 loss, injury + disease: Cuticle: wax, protective covering/prevents h2o loss: waxy part: Stomates: openings in the lower epidermis, allow exchange of gases between external + internal environment: Guard Cells Below is a close diagram of the leaf structure: The basic structure of a leaf. By Staff Writer Last Updated Mar 31, 2020 1:06:27 AM ET. The unique plant cell has similar parts and functions to an animal cell but a few distinct differences. The surface of many leaves is coated with a waxy cuticle which is secreted by the epidermis. All plant cells have a cell wall and a cell membrane. Take a good look at the diagram and the various parts of the leaf … The mesophyll contains cells called chloroplasts, which convert sunlight into a stable chemical energy source the plant can utilize. Types 5. The stomata close in the night to retain gases and moisture in the leaf cells and opens during the day for gaseous exchange to continue. Start studying Parts of leaf cell. The guard cells (and stoma) are part of the epidermis. Parts 4. The leaf blade is composed of tissue layers, each having an important part to play in a functioning leaf. guard cell - one of a pair of sausage-shaped cells that surround a stoma (a pore in a leaf). In What Part of a Leaf Does Most Photosynthesis Occur? Notably the presence of a more rigid cell wall and the modification to photosynthesize which requires chloroplast. epidermis - the protective, outler layer of cells on the surface of a leaf. Characteristics of Leaf 3. Learn vocabulary, terms, and more with flashcards, games, and other study tools. Epidermis – The leaf's outer layer and protective "skin" surrounding leaf tissues. Except for the thylakoid membranes , where the clorophyll molecules reside, the rest of my colors are just there to help you see the parts, and to make pretty pictures. 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