Name: _____________________________________________ Date: __________ Block: ________ Cells in a Leaf: Chapter 23 Section 4 Reading Comprehension: Read through pages 595 to 596 in your textbook and answer the following questions in the space provided. 1. Describe how the structure of a leaf is optimized for light absorption. 2. What factors regulates the opening and the closing of stomata? 3. Are stomata more likely to be open or closed on a hot day? Explain your answer. 4. The leaves of desert plants often have two or more layers of palisade mesophyll, rather then the single layer that is characteristic of most leaves. How might this modified structure be advantageous to a desert plant? Leaf Cross Section Diagram: Leaf Structures and their Functions: Define the function of each of the leaf structures found below. Cuticle: __________________________________________________________________________ ________________________________________________________________________________ Epidermis: _______________________________________________________________________ ________________________________________________________________________________ Palisade Mesophyll: ________________________________________________________________ ________________________________________________________________________________ Spongy Mesophyll: _________________________________________________________________ ________________________________________________________________________________ Xylem: __________________________________________________________________________ ________________________________________________________________________________ Phloem: _________________________________________________________________________ ________________________________________________________________________________ Vein: ____________________________________________________________________________ ________________________________________________________________________________ Stoma: __________________________________________________________________________ ________________________________________________________________________________ Guard Cells: ______________________________________________________________________ ________________________________________________________________________________ Bundle Sheath: ____________________________________________________________________ ________________________________________________________________________________ Labeling Leaf Structures: Label each structure on the diagram found below