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Photosynthesis: The Transformative Process that Shaped Earth

Explore the pivotal process of photosynthesis and its impact on the planet, from trapping sunlight to producing oxygen. Uncover the historical significance of oxygen production, enabling complex life forms and terrestrial existence. Dive into the core concepts and evolution of this fundamental mechanism.

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Photosynthesis: The Transformative Process that Shaped Earth

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  1. Photosynthesis Process which changed a planet

  2. “Goals” of Photosynthesis • To trap sunlight (radiant energy) • To produce glucose (photons converted to chemical energy) • Accidental Event:Making Oxygen Gas!! (02)

  3. The full range of radiation is called the electro-magnetic spectrum

  4. SUMMARY OF KEY CONCEPTS • Overall Equation for Photosynthesis Light energy Photosynthesis Carbon dioxide Water Glucose Oxygen gas Visual Summary 7.1

  5. Question: • Where does the plant get the carbon atoms to make glucose?

  6. Question • How did cellular respiration release the stored energy of glucose? • Taxi-cabs stripped off high energy electrons (H atoms) from glucose and sent to the ETC

  7. Question • How does photosynthesis put energy into glucose? • It takes low energy electrons (H atoms) from water, and “excite” the electrons with photons of light! • H atom + photon  High E electron!

  8. Trapping Sunlight in an electron

  9. What is source of H for glucose?What remains when H is taken? Light energy Photo-synthesis Oxygen gas Glucose Carbon dioxide Water Unnumbered Figure 7.1

  10. How do plants make oxygen? • ANSWER:

  11. Why was oxygen production on Earth important? • Original atmosphere was anaerobic • First life forms were anaerobic(3.5 bya)

  12. Why was oxygen production on Earth important? • Cyanobacteria “invented” photosynthesis • Oxygen build-up (about 2 bya) • Poisoned some of original life forms(First “pollution” crisis!) • Gave eukaryotes an advantage (They could do aerobic cellular respiration) • Complex organisms (P,A,F) now possible with aerobic cellular respiration • Terrestrial life possible with formation of the ozone layer (03)

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