1. Why study photosynthesis?

2. Environment Source of earth’s oxygen Uses carbon dioxide to prevent greenhouse gases

3. Agriculture Food Sugar cane most efficient plant

4. Energy Production Ethanol and fuels

5. Electronics Solar power Light-based computer chips

6. Medicine/Health Care Natural sunscreens Cures for disease Skin care

7. Fiber/Materials Clothes Construction Paper, wood

8. What is Photosynthesis (Sunlight and chlorophyll) C0 2 + H 2 0-------------------  C 6 H 12 0 6 + 0 2 Carbon dioxide + water makes glucose + oxygen

9. Where does it take place? Chloroplasts in leaves

10. Assignment Fold a piece of paper into thirds Draw and color a LEAF (See Figure 23-18, pg. 596). Label the veins. Draw and color the LEAF CROSS SECTION on pg. 596. Label the spongy mesophyll, guard cells, cuticle, upper epidermis, palisade mesophyll, xylem, phloem, vein, lower epidermis, stoma. Draw and color the CHLOROPLAST on pg. 208. Label the stroma, granum, thylakoids. It should look like this: LeafCross- section chloroplast

11. Leaf cross-section “ Pathway of Photosynthesis” C0 2 + H 2 0-------------------  C 6 H 12 0 6 + 0 2

12. Cuticle-waterproof, waxy coating; protects leaf from water loss cuticle

13. Epidermis- cube shaped cells; outermost layer; upper and lower LIGHT ENTERS HERE Upper epidermis Lower epidermis

14. Mesophyll includes: Palisade layer- tall columnar shaped cells: CONTAIN CHLOROPLASTS Palisade layer

15. Mesophyll includes: Spongy layer – cells arranged with air spaces – OXYGEN AND C02 ENTER AND LEAVE HERE Spongy Mesophyll

16. Vascular bundle-vein Xylem-WATER moves UP to leaves FROM ROOT Xylem

17. Vascular bundle Phloem-FOOD moves DOWN to ROOTS Phloem

18. Stomata- opening to allow water and GAS exchange stomata

19. Guard Cells-regulates opening of stomata according to water pressure Guard cells