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Photosynthesis

Photosynthesis. 1. Light reaction Recap 2. Calvin Cycle (dark reaction). Talk to a Neighbor…. Using the following diagram, walk your partner through the 5 steps of the light-dependent reactions. Video clip. Summary of Part 1:. Using light energy ADP NADP+ H 2 O

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Photosynthesis

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  1. 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. Video clip Summary of Part 1: Using light energy ADP NADP+ H2O changed into ATP NADPH H+ & O2

  4. O2 gas is released as a by-product through the stomata (pores) on the leaf • The energy of ATP and NADPH are now used to power Part 2 of photosynthesis: The Calvin Cycle (Light-Independent Reactions)

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

  6. Calvin Cycle uses ATP & NADPH to produce high-energy sugars

  7. Energy taken out of NADPH & ATP & combined w/CO2 & H+ forming C6H12O6

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

  9. Calvin Cycle Video

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

  11. Putting it Together…

  12. Review light rxn

  13. Reactants • Diagram 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. Reactants Products

  16. Questions??

  17. What are the reactants for photosynthesis? • What are the products?

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

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

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

  21. Where does gas exchange occur on the leaf?

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

  23. Cornell Summary

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