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Welcome to Class! 11-6 Complete the following: Turn In Home Fun: Elodea Lab and Cornell Notes Photosynthesis Overview Notes Concept Map Homefun: Concept Map of Photosynthesis Overview
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Photosynthesis: An Overview
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Learning Objectives Explain the role of light and pigments in photosynthesis. Explain the role of electron carrier molecules in photosynthesis. State the overall equation for photosynthesis.
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Light Light energy from the sun must be captured for photosynthesis to occur. Sunlight is “white” light—actually a mixture of different wavelengths.
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Chlorophyll Photosynthetic organisms capture energy from sunlight with pigments—principally with chlorophyll.
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Chlorophyll Photosynthesis takes place inside organelles called chloroplasts. Plant Cell Chloroplast
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In plants, photosynthesis takes place inside chloroplasts. Thylakoid Granum Thylakoid membrane Stroma
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High Energy Electrons The high-energy electrons produced by chlorophyll are highly reactive and require a special “carrier.”
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High Energy Electrons An electron carrier is a compound that can accept a pair of high-energy electrons and transfer them, along with most of their energy, to another molecule.
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High Energy Electrons NADPH can carry the high-energy electrons that were produced by light absorption in chlorophyll to chemical reactions elsewhere in the cell.
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An Overview of Photosynthesis Photosynthesis uses the energy of sunlight to convert water and carbon dioxide (low-energy reactants) into high-energy sugars and oxygen (products). Carbon dioxide + Water → Sugars + Oxygen light +→ + C 6 H 12 O 6 6CO 2 6H 2 O6O 2
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Photosynthesis and Light Photosynthesis involves two sets of reactions: Light-dependent reactions Light-independent reactions
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Light-Dependent Reactions Light-dependent reactions require the direct involvement of light and light-absorbing pigments. Water Oxygen
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Light-Independent Reactions Light-independent reactions use ATP and NADPH molecules produced in the light-dependent reactions to produce high-energy sugars from carbon dioxide Sugars and Carbohydrates Carbon Dioxide
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Interdependence of Reactions Light-dependent and light-independent reactions have an interdependent relationship.
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Student Worksheet Answers
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