1. Ms. Rosendo Biology (10th Grade)
Photosynthesis
Ms. Rosendo
Biology (10th Grade)

2. Objectives Describe the photosynthesis reaction in detail.
Mention the molecules involved in the reaction process.
Identify the types of chlorophyll present in plants.
Establish the importance of the photosynthesis process and photosynthetic organisms.

3. Photosynthetic Organisms
The sun is the primary energy source that maintains all life forms.
Photosynthesis is a process that transforms solar energy into chemical energy. This energy is then stored in carbohydrates and/or lipids.
Only 2% of the 42% of solar energy that reaches the planet, is captured by photosynthesizers.

6. Photosynthesis and light

7. Photosynthesis and light

9. Chlorophyll and other pigments
Chlorophyll a (680nm)
Photosynthetic eukaryotes and cyanobacteria
¾ of the total content of chlorophyll
Involved in the production of oxygen.
Chlorophyll b (650nm)
Plants, green algae and euglenoids
Accessory
Augments the spectrum of absorption
Energy that transfers to chlorophyll a

10. Chlorophyll and other pigments
Chlorophyll c
Some brown algae and diatoms
Similar function of the chlorophyll b.
Carotenoids
All chloroplast and cyanobacteria
Carotenes and xanthophyll’s
Antioxidants
Phycobilin
Cyanobacteria and red algae

11. Photosynthesis Equation
light
3CO2 + 6 H2O → C3H6O3 + 3O2 + 3H2O

12. Reactions

14. Reactions that involve light

15. Photosystems

17. Photosystems Photosystem 1 Photosystem 2 P700
Strome thylakoid or external thylakoid of the grana.
Photosystem 2
P680
Grana thylakoid

18. Non-cyclic phosphorylation

21. Cyclic phosphorylation

24. Electron Transfer

28. Dark Reactions

29. Calvin Cycle: Phase 1

30. Calvin Cycle: Phase 2

31. Calvin Cycle: Phase 3