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3. Learning Targets Students will be able to: 1. Explain what a leaf is and its parts. 2. Know the difference in compound and simple leaves. 3. Explain how to identify leaves from other ways.

4. Leaves – the real work horses: Main function: to make food and other chemicals needed for growth and reproduction Where Photosynthesis takes place ARS photo.

5. Why do leaves turn colors? The chlorophyll dries up Give it its color change

6. Leaf Parts Margin Vein Blade Petiole Midrib

7. Main leaf parts: Blade: broad, thin part of the leaf NRCS graphic

8. Main leaf parts: Petiole: narrow cylindrical part, may not be apparent

9. Main leaf parts: Margin: Edge of leaf Margin

10. Leaf Margins Entire Smooth margins Wavy Waved margins Serrate Sharp margins Angular Sharp Wavy sharp margins Lobed/Notched Open loops

11. Main leaf parts: Veins: Structural framework of the leaf

12. Leaf Veins Venation (veins) – parallel, pinnate, palmate, forked U.S. Geological Survey drawings

13. Main leaf parts: Midrib: Large center vein Midrib

14. 2 types of leaves: Simple leaf with one blade Examples: grasses, oak, apple Compound several leaflets May be joined to the petiole or along the central axis of the leaf. U.S. Geological Survey graphics

15. Leaves and Branching Patterns Alternate Leaves alternate each other Opposite Leaves are opposite each other Whorled Leaves in a swirl pattern

16. Questions????

17. Leaf Assignment Copy down the following chart, leave space between each line: Drawings Leaf Type Compound Leaf Alternating Branch Opposite Branch Whorled Branch Entire Leaf Margin Wavy Leaf Margin Serrate Leaf Margin Angular Sharp Leaf Margin Lobed/Notched Leaf Margin Parallel Vein Pinnate Vein Palmate Vein Simple Leaf DrawingsExamples

18. Cont…… Define each word on the left side Draw a picture in the middle Give an example on the right side

19. Leaf Assignment Example Leaf Type Compound Leaf DrawingsExamples White Oak

20. Ticket out the Door Get out a piece of paper and write your name on it Answer the following questions: 1. Write 3 things that you learned 2. Write 2 things that you found interesting 3. Write 1 thing that you have questions about