1. 8.2 Photosynthesis p230

2. Q: What role do pigments play in the process of photosynthesis?
A: Photosynthetic organisms capture energy from sunlight with pigments.
A plant looks green because green is the only light/color reflected.

3. Chlorophyll & Chloroplasts
Pigments: light-absorbing molecules
Chlorophyll: plants’ principal pigment (reflects green) absorbs light energy
Chloroplasts: Where photosyn. takes place
Thylakoid: photosynthetic membranes in chloroplast.
Stroma: Fluid portion of chloroplast outside of thylakoid.

4. High-Energy Electrons
Q: What are electron carrier molecules?
A: A compound that can accept a pair of high-energy electrons & transfer them, along with most of their energy, to another molecule.
NADP+ accepts electrons & transfers them along with energy to other molecules
Converts to NADPH

5. An Overview of Photosynthesis
What are the reactants & products of photosynthesis?
Reactants (what goes in): Sunlight, water & carbon dioxide
Products (what is produced): high-energy sugars & oxygen
6CO2 + 6H2O light C6H12O6 + 6O2

6. Light-Dependent Reaction
Requires light.
Water, light NADP+ & ADP go into the thylakoid.
Oxygen & NADPH & ATP are produced.

7. Light-Independent Reaction
No light needed.
Reactants: NADPH, ATP, carbon dioxide
Products: NADP+, ADP, Sugars

8. 6CO2 + 6H2O light C6H12O6 + 6O2
Thylakoid
Calvin
Cycle

10. Photosynthesis Under Extreme Conditions
C4 Photosynthesis-have specialized chemical pathway that allows them to capture even very low levels of CO2.
CAM Plants-adapt to dry climates & use different strategy to obtain carbon dioxide while minimizing water loss.

11. WB pgs
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