1. Do Now: Read over HW before handing it in
1. The leaves of a plant appear green because chlorophyll :
a. reflects blue light b. absorbs blue light
Reflects green light d. Absorbs green light
Write the basic equation for photosynthesis ____________________________
What role to plant pigments play in the process of photosynthesis?
____________________________________________________

2. 8.3 The Process of Photosynthesis
Lesson Overview
8.3 The Process of Photosynthesis

3. Light Dependent Reactions: to make ATP and NADPH
Photosystems- In the thylakoid membrane the clusters of chlorophyll and proteins
They absorb light and generate high energy electrons that are then passed by electron carriers

4. The Light-Dependent Reactions: Generating ATP and NADPH

5. PHOTOSYSTEM 2
Where it all starts
Step 1
-Light is absorbed by pigments (chlorophyll) and energizes electrons to move down chain.
-Water molecules are split into H+ (hydrogen ions), oxygen, and high energy electrons, to replace used electrons

6. Photosystem II

7. Photosystem II
These “high energy electrons” move down the electron transport chain (carrier proteins) -

8. Photosystem II

9. Photosystem II

10. Electron transport chain
-Electrons’ energy is used to pump H+ ions into the thylakoid space
-Electrons move to Photosystem I

11. Electron Transport Chain

12. Photosystem I
At the end of the chain, NADP+ picks up H+ and electrons to become NADPH

13. Electron Transport Chain

14. Photosystem I. Making ATP
The remaining H+ ions in the thylakoid space move through the ATP synthase (a channel) in the thylakoid membrane, causing a rotation which makes ATP (from ADP)

15. Hydrogen Ion Movement and ATP Formation

16. Hydrogen Ion Movement and ATP Formation

17. Sum of PHOTOSYSTEM II and I (print at home or I will put this slide back up at end of lecture)
Photosystem II: Light energy is absorbed by pigments-energizes electrons
Water molecules are split into Hydrogen ions, Oxygen, and replacement electrons
High-energy electrons move down the electron transport chain, where energy from the electrons is used to pump Hydrogen ions into the thylakoid space
Photosystem I: At the end of the chain, NADP+ molecules pick up the high-energy electrons and Hydrogen (H+) ions to become NADPH.
The H+ ions in the thylakoid space pass through ATP synthase in the thylakoid membrane, causing a rotation that produces ATP

18. DO NOW: HAND IN HW (pg 234 1 and 2 all)
What does the photons of light excite (give energy to) _____________________
High Energy electrons move down the __________ _____________ ____________
What is first Photosystem I/Photosystem II
What is a product of light independent reactions:
(water, light, glucose, carbon dioxide)
What is a reactant of light independent reactions

19. Where we are going
Do now (done)
HW Review (now)
P.Point
Finish 3 min video
Biomanbio.com
8.3 challenge sheet
HW text questions

20. HW REVIEW pg all and 2 all 1 2
Why are pigments such as chlorophyll needed for photosynthesis? How well would a plant grow under pure yellow light?
What is the function of NADPH?
Capture light
Carry sugars
Transfer electrons
Light energy is absorbed by _____________ producing high energy ___________
Turning: ADP to ______
:NADP+ to ____

21. Light Independent Reactions
8.3 photosynthesis part 2
Light Independent Reactions

22. The Light-Independent Reactions: Producing Sugars
Into the reaction: NADPH, ATP, CO2 Out of the reaction: NADP+, ADP, Sugars Where?? In the Stroma!

23. Light Independent Reactions: Making Sugar
Also called the Calvin Cycle
What is the Calvin Cycle?
***the process in which ATP and NADPH from the light-dependent reactions are used to produce high-energy sugars***

24. Summary of the Calvin Cycle

25. Calvin Cycle: CO2 joins the party
CO2 comes in from the atmosphere
The CO2 gets changed into various compounds/molecules with the energy from ATP and the electrons from NADPH

26. Summary of the Calvin Cycle

27. How sweet it is!! Making Sugar
-Some of the new carbon molecules are used to make a single 6-carbon sugar molecule (phospo-glucose)
-this sugar molecule is used to make vital macromolecules like lipids, proteins, and cellulose (carbs).
(IT TAKES 6 CALVIN CYCLES TO PRODUCE A SUGAR)
-The big idea= turning CO2 into sugar via ATP and electrons from NADPH

28. Factors that Affect Photosynthesis
Temperature: most plants works best 0-35 degrees Celsius (32-95 F) Light- more light=more photosynthesis (to a maximum) Water- shortage can slow down, and damage plant tissues

29. It is rough out here! Tough plants
There are some plants that have evolved for harsh conditions.
The C4 plants: have adapted to live in high temperature and high light environments by using special chemical pathways to capture low levels of CO2 (corn, sugar cane)
The CAM plants: live in low water environments (deserts). Have special acids to trap water at night. (cactus)

30. Go to: https://biomanbio.com/
BIOMANBIO
Go to:
Click Respiration & Photosynthesis on left of screen
Click photosynthesis interactive!
Go through all games and quiz yourself
Show me score when finished