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Photosynthesis

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.

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Photosynthesis

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  1. Photosynthesis Chapter 8

  2. Trophs • Autotrophs • Heterotrophs

  3. The Meaning of Life…

  4. 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

  5. Chlorophyll • Chlorophyll a • Chlorophyll b • Pigments that absorb varying frequencies of light. • Poor absorbers of blue-green frequency

  6. 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

  7. Light Dependent Reactions

  8. 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.

  9. Mr. Calvin • ATP and NADPH from the light-dependent reactions are used by the Calvin Cycle to create sugars.

  10. Factors Affecting Photosynthesis • Water availability • Sunlight intensity • Temperature (photosynthetic enzymes function best from 0-35 degrees C) • Light Wavelength

  11. light Back and Forth 6CO2 + 6H2O C6H12O6 + 6O2

  12. O2 + sugar CO2 +H2O

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