1. Chapter 10 Photosynthesis

2. Photosynthesis

3. Ps General Equation Requires:

4. Question u Does the Oxygen in sugar come from the CO 2 or from the H 2 O ? u Model: CO 2 + 2 H 2 O ----> CH 2 O + O 2

5. Proof u Used 18 O as a tracer. CO 2 + 2 H 2 O ----> CH 2 O + O 2

6. Ps: a redox process

7. Ps

8. Light

9. Too Hot Too Cold Just Right

11. Action Spectrum

14. Comment u In oceans, red light is lost or filtered out early because it has lower energy. u Only blue light which has higher energy can reach the lower depths.

15. Result u Many deep ocean fish are bright red in color. u Why? u They can’t be seen because there is no red light to reflect their color.

16. Photosynthesis Pigments

17. Chlorophylls

20. Accessory Pigments

21. Fall Leaf Colors

22. Chloroplast Structure

24. Photosystems

27. Cyclic Photophosphorylation

29. Noncyclic Photophsphorylation

30. Light Reaction

35. u Location – u Function

36. Light Reaction RequirementsProducts

37. Chemiosmosis Model

38. Chemiosmosis

41. Comment u There can be a 3 pH unit difference between the thylakoid space and the stroma.

43. Movie - Summary

44. Dark Reactions

45. Dark Reaction

46. Rubisco

50. C3 Ps RequirementsProducts

52. Photorespiration

54. Alternate Ps Methods 1. C4 Ps 2. CAM Ps

55. C4 Ps

56. PEP Carboxylase

58. C4 Ps

59. C3 Ps vs C4 Ps Photorespiration Shade to full sun High water use Cool temperatures Slow to moderate growth rates Cool season crops No Photorespiration Full sun only Moderate water use Warm temperatures Very fast growth rates Warm season crops

60. CAM Ps

62. CAM plants

64. Ps:Rs Ratios u Reflect a plant’s balance in making food and using food. 1. Ps > Rs, energy available for growth and reproduction. 2. Ps = Rs, no growth, but don’t die either. 3. Ps < Rs, death by starvation

65. Comments - Ps:Rs

66. Factors That Affect Ps 1

67. Importances of Ps

68. Summary u Know the main Ps equation. u Know Light Reaction. u Know Dark Reaction. u Alternate Ps forms. u Ps:Rs ratios.