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Photosynthesis. Chapter 8. Trophs. Autotrophs Heterotrophs. The Meaning of Life…. Photosynthesis. 6CO 2 + 6H 2 O C 6 H 12 O 6 + 6O 2 Photosynthesis uses the energy of sunlight to convert water and carbon dioxide into high-energy sugars and oxygen. - PowerPoint PPT Presentation
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Photosynthesis
6CO2 + 6H2O C6H12O6 + 6O2
• Photosynthesis uses the energy of sunlight to convert water and carbon dioxide into high-energy sugars and oxygen.
• Green things are generally understood to be photosynthesizers
Chlorophyll• Chlorophyll a
• Chlorophyll b
• Pigments that absorb varying frequencies of light.
• Poor absorbers of blue-green frequency
Chloroplasts
• Thylakoids- contain photosystems which are the light-collecting units
• Sunlight excites electrons in the chlorophyll which are then passed to electron carriers
(Sound familiar?)
• NADP+ is charged with an electron to form NADPH
Light Dependence
• Two reactions are considered light-dependent in photosynthesis
• Photosystem II absorbs light and produces energized electrons, H+ ions, and water.
• Photosystem I receives tired electrons from II, are re-energized by sunlight, and used to make NADPH which passes to Calvin.
Mr. Calvin
• ATP and NADPH from the light-dependent reactions are used by the Calvin Cycle to create sugars.
Factors Affecting Photosynthesis
• Water availability
• Sunlight intensity
• Temperature (photosynthetic enzymes function best from 0-35 degrees C)
• Light Wavelength