1. 1. Light reaction Recap 2. Calvin Cycle (dark reaction)
Photosynthesis
1. Light reaction Recap
2. Calvin Cycle (dark reaction)

2. Talk to a Neighbor…
Using the following diagram, walk your partner through the 5 steps of the light-dependent reactions

3. What are the reactants of the light dependent reactions?
Sunlight, water, chlorophyll
What are the products of the light dependent reactions?
Oxygen, ATP, NADPH

4. ATP & NADPH that are produced in the LDR are used to power the Calvin Cycle

5. Part 2: Calvin Cycle aka Light-Independent reaction or Dark reaction
Does NOT need light because energy from sun already captured in NADPH & ATP
Occurs in stroma

6. Energy taken from NADPH & ATP & combined w/CO2 & H+ forming C6H12O6

7. NADP & ADP recycled back to light reaction
Glucose can be converted by cells into lipids, proteins, nucleic acids, etc.

8. Calvin Cycle Video

9. Factors that affect the rate of photosynthesis?
Amount of water & CO2 (reactants)
Temperature - too high or low denatures enzymes
Intensity of light

10. Putting it Together…

11. Reactants Products

12. Review light rxn

13. Reactants Diagram H2O CO2 Light Chloroplast C6H12O6 Glucose O2
Word Bank
H2O
Glucose
Light -Dependent
Chloroplast
Thylakoids
Grana
Calvin Cycle
Light O2
Stroma
Reactants
Products
H2O
CO2
Light
NADP+
ADP + P
Light
Dependent Reaction
Calvin Cycle
ATP
NADPH
Chloroplast
C6H12O6
Glucose O2
Products

14. Summary:
Light Dependent Reaction—H2O is broken down and light energy is stored temporarily in energy carriers, ATP and NADPH
Calvin Cycle—energy is transferred from ATP and NADPH to the organic compound glucose

15. Questions??

16. What are the reactants for photosynthesis?
What are the products?

17. Where in the chloroplast do light-independent reactions occur?
Stroma

18. Where do the ATP and NADPH used in the Calvin Cycle come from?
Light Reactions

19. What are the 3 factors that affect the rate of photosynthesis?

20. Where does gas exchange occur on the leaf?

21. What happens to the O2 produced by the light reactions?

22. Cornell Summary