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Photosynthesis: A Sunlight Energy Conversion Process

Explore the process of photosynthesis, where plants capture sunlight energy using chlorophyll, converting water and carbon dioxide into sugars and oxygen. Discover how high-energy electrons move through electron carrier molecules, driving the synthesis of NADPH. Learn about chloroplasts, thylakoids, and the importance of chlorophyll in absorbing visible light. Witness the transformation of light energy into chemical energy, essential for sustaining life on Earth.

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Photosynthesis: A Sunlight Energy Conversion Process

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  1. 8.2 Photosynthesis An Overview

  2. Chlorophyll & Chloroplasts • The wavelengths of the visible spectrum are different colors: red, yellow, green, blue, indigo, violet. • Photosynthetic organisms capture energy from sunlight with pigments • Chlorophyll reflects green light • In the fall, as temperatures drop, chlorophyll molecules break down, making the leaves different colors.

  3. Chloroplasts contain thylakoids. They are arranged in stacks called grana. The liquid part is called stroma. • Chlorophyll absorbs visible light very well. A lot of that light energy is transferred to electrons. These electrons make photosynthesis work.

  4. High Energy Electrons • Electron carrier-compound that can accept a pair of high-energy electrons & transfer them along with most of their energy to another molecule. • 1 electron carrier molecule is NADP+. This accepts & holds 2 high-energy electrons & a Hydrogen ion (H+). The NADP+ is converted to NADPH. NADPH carries electrons to other molecules in the body.

  5. Photosynthesis • Uses the energy of sunlight to convert water & carbon dioxide (reactants) into high-energy sugars & oxygen (products) • In symbols: 6CO2 + 6H2O  C6H12O6 + 6O2 • In words: carbon dioxide + water  sugars + oxygen

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