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8.2 Photosynthesis An Overview. Chlorophyll & Chloroplasts  The wavelengths of the visible spectrum are different colors: red, yellow, green, blue, indigo,

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Presentation on theme: "8.2 Photosynthesis An Overview. Chlorophyll & Chloroplasts  The wavelengths of the visible spectrum are different colors: red, yellow, green, blue, indigo,"— Presentation transcript:

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: 6CO 2 + 6H 2 O  C 6 H 12 O 6 + 6O 2  In words: carbon dioxide + water  sugars + oxygen


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