2. 2.WHY DO LEAVES Why do leaves chang change color in the f fall? Bellringer

3. Objectives: I CAN… □Relate the structure of a chloroplast to the events in photosynthesis

5. To trap the energy in the sun’s light, the thylakoid membranes contain pigments, molecules that absorb specific wavelengths of sunlight.

6. PHOTOSYNTHESIS

7. Photosynthesis Reaction (reactants)(products) 6CO 2 + 6H 2 O + sunlight ----> C 6 H 12 O 6 + 6O 2

8. http://www.brainpop.com/science/cellularlifeandgenetics/photosynthesis/

9. Photosynthesis Process that uses the sun’s energy to make simple sugars Take Notes! Topic: Photosynthesis

10. Photosynthesis Equation CO 2 + H 2 O → C 6 H 12 O 6 + O 2 Take Notes! Topic: Photosynthesis

11. 1.Where does photosynthesis take place? Chloroplast in plant cells 2. What is the purpose of pigment? Molecules that take in specific wavelengths of sunlight 3. What is the most common pigment in plants? Chlorophyll 4. Why do leaves change color in the fall? Plants stop producing chlorophyll so other pigments become visible

12. Chloroplasts contain several kinds of pigments, the most common is chlorophyll.

13. Pigments molecules that absorb specific wavelengths of sunlight Chlorophyll most common in leaves Take Notes! Topic: Photosynthesis

14. WHY ARE PLANTS GREEN? Chlorophyll absorbs most wavelengths of light except green. Chlorophyll reflects the green, so that’s what you see!

15. Two STAGES of Photosynthesis 1.The light- dependent reactions convert light energy into chemical energy (ATP) 2. ATP fuels the light- independent reactions that produce simple sugars. Take Notes! Topic: Photosynthesis

17. The following table shows how much of each pigment is present within a leaf during different months. Use the information to answer the questions that follow. Pigment MayJuneJulyAugustSeptemb er October Chlorophyll 2.922.953.373.15 1.58 0.6 Xanthophyll 1.121.050.890.821.171.32 Carotene 2.322.252.222.202.622.88 1. During which months is the amount of Carotene in a leaf greater than the amount of Chlorophyll? 2. Looking at the table, what months will all of the leaves be green?

18. WHY DO LEAVES CHANGE COLOR IN THE FALL?