Photosynthesis Overview
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Transcript of Photosynthesis Overview
![Page 1: Photosynthesis Overview](https://reader034.fdocuments.us/reader034/viewer/2022052215/559ebad41a28ab7e2a8b45e6/html5/thumbnails/1.jpg)
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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Chloroplast
In plants, photosynthesis takes place inside chloroplasts.
ThylakoidGranum
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 + Oxygenlight
light+ → +
C6H12O66CO2 6H2O 6O2
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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 andCarbohydrates
Carbon Dioxide
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Interdependence of Reactions
Light-dependent and light-independent reactions have an interdependent relationship.