1. Photosynthesis and Cellular Respiration

2. All living things depend on energy ATP is used by all cells as their basic energy source Where does this ATP come from?

3. Where does Energy (ATP) come from? PhotosynthesisCellular Respiration (aerobic) What is it for? Who does it? Formula Organelle Reactions/location Reactants Products If NO oxygen is present, then…

4. Autotrophs use light energy from sun to produce food (sugars) Heterotrophs obtain energy from the food they consume

5. Photosynthesis 6CO 2 + 6H 2 O C 6 H 12 O 6 + 6O 2 Cellular Respiration

6. Photosynthesis 6CO 2 + 6H 2 O C 6 H 12 O 6 + 6O 2 glucose SUN

7. Question: Where does photosynthesis take place?Where does photosynthesis take place?

8. Plant Leaf Cell Wall Nucleus Chloroplast Central Vacuole

9. Chloroplast OrganellephotosynthesisOrganelle where photosynthesis takes place. Granum Thylakoid Stroma

10. Two Parts to Photosynthesis

11. Two main parts of Photosynthesis Calvin Cycle aka Light Independent Rxn Occurs in the stroma Uses the ATP and NADPH Converts CO 2 to glucose Light Dependent Rxn Occurs in the thylakoids energy sunATPCaptures energy from sun as ATP NADPH NADPH O 2Produces O 2

12. Thylakoid Granum chlorophyll Has pigment chlorophyll – absorbs light

13. C 6 H 12 O 6

14. Question: Why are plants green?Why are plants green?

15. Chlorophyll Molecules thylakoid membranesLocated in the thylakoid membranes. Chlorophyll pigmentsblueChlorophyll pigments absorb light (blue and red). Plantsgreen wavelengthreflectednot absorbedPlants are green because the green wavelength is reflected, not absorbed.

16. Thylakoid Granum chlorophyll Has pigment chlorophyll – absorbs light

17. Wavelength of Light (nm) 400500600700 Short waveLong wave (more energy)(less energy)

18. Question: During the fall, what causes the leaves to change colors?During the fall, what causes the leaves to change colors?

19. Fall Colors green chlorophyll greatly reduced other pigmentsDuring the fall, the green chlorophyll pigments are greatly reduced revealing the other pigments.

20. What factors affect photosynthesis? 6CO 2 + 6H 2 O C 6 H 12 O 6 + 6O 2 SUN intensity of sunlight water temperature