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Complexity and Shapes of Leaves AGR 161: Unit C

Complexity and Shapes of Leaves AGR 161: Unit C. Found on Internet: Unknown Source Created By: Jennifer Stewart. Objectives. Recognize the complexity of Leaves Identify leaf shapes. Principal Tissues of the Leaf. Epidermis Cuticle Waxy substance covers the leaves and stems

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Complexity and Shapes of Leaves AGR 161: Unit C

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  1. Complexity and Shapes of LeavesAGR 161: Unit C Found on Internet: Unknown Source Created By: Jennifer Stewart

  2. Objectives • Recognize the complexity of Leaves • Identify leaf shapes

  3. Principal Tissues of the Leaf • Epidermis • Cuticle • Waxy substance covers the leaves and stems • Waterproof layer that keeps water in plants

  4. Principal Tissues of the Leaf • Epidermis (cont) • Stomata • Openings in the epidermis mainly located on underside of leaves • Exchange of gases

  5. Principal Tissues of the Leaf • Epidermis (cont) • Guard Cells • Two cells located on each side of stomata • Open and closes stomata • Allows gas exchange

  6. 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

  7. 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

  8. What is the difference between a simple leaf and a compound leaf? • simple leaf = 2 parts (leaf blade and petiole)

  9. What is the difference between a simple leaf and a compound leaf? • Compound leaf: leaf blade divided into leaflets

  10. What are the different types of compound leaves? • Palmately compound

  11. What are the different types of compound leaves? • Pinately compound

  12. What are the different types of compound leaves? • Trifoliate (alfalfa)

  13. Shape and size of leaves • vary among plants • used for identification of plants

  14. Review • What is the difference between a simple leaf and a compound leaf?

  15. Review • What type of compound leaf is this?

  16. Review • What are the three parts of the epidermis? • What is the cuticle? • What are the guard cells? • What are the three different leaf shapes?

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