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8.2 Photosynthesis p230

Learn about the role of pigments in the process of photosynthesis, including the functions of chlorophyll, chloroplasts, and electron carriers. Explore the reactants, products, and different reactions involved in photosynthesis. Discover how photosynthesis occurs under extreme conditions. (332 characters)

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8.2 Photosynthesis p230

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  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

  9. 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.

  10. WB pgs 119-121 • Skip #9 & 15 • Keep papers to review in 15 min…..

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