Complexity and Shapes of Leaves Objectives   Recognize the complexity of Leaves Identify leaf shapes Principal Tissues of the Leaf  Epidermis  Cuticle Waxy substance covers the leaves and stems  Waterproof layer that keeps water in plants  Principal Tissues of the Leaf  Epidermis (cont)  Stomata Openings in the epidermis mainly located on underside of leaves  Exchange of gases  Principal Tissues of the Leaf  Epidermis (cont)  Guard Cells Two cells located on each side of stomata  Open and closes stomata  Allows gas exchange  Principal Tissues of the Leaf  Mesophyll layer  Palisade mesophyll   Primary site of photosynthesis Spongy mesophyll Contains air and chloroplasts  Site of photosynthesis and gas exchange  Principal Tissues of the Leaf  Veins or vascular bundles In spongy mesophyll  Phloem tissues conduct food from photosynthesis to rest of plant  Xylem tissues conduct water and minerals up to cells in leaves and stems  What is the difference between a simple leaf and a compound leaf?  simple leaf = 2 parts (leaf blade and petiole) Leaf Blade Petiole What is the difference between a simple leaf and a compound leaf?  Compound leaf: leaf blade divided into leaflets What are the different types of compound leaves?  Palmately compound What are the different types of compound leaves?  Pinately compound What are the different types of compound leaves?  Trifoliate (alfalfa) Shape and size of leaves   vary among plants used for identification of plants Review  What is the difference between a simple leaf and a compound leaf? Review What type of compound leaf is this?

Complexity and Shapes of Leaves

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