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Understanding Photosynthesis: Light Reactions and Calvin Cycle

Explore the intricate processes of photosynthesis in Chapter 6, pages 116-124. Learn how light absorption leads to electron transport chain and chemiosmosis in the thylakoid membrane. Discover the key steps of the Calvin Cycle in the stroma, producing sugars from CO2 and ATP. Uncover the role of pigments like chlorophyll a and carotenoids in capturing light energy. Delve into the factors affecting photosynthesis rate, from light intensity to temperature. Enhance your knowledge of this vital biological process!

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Understanding Photosynthesis: Light Reactions and Calvin Cycle

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  1. Photosynthesis Chapter 6 pg. 116-124

  2. The Light Reactions • Steps: • Light absorption  Electron Transport Chain  Chemiosmosis

  3. Light Reaction • Location: Thylakoid Membrane • Reactants: Light and H2O • Product: O2 (waste product) and ATP

  4. Calvin Cycle • Location: Stroma • Reactants: CO2 and ATP • Product: C6H12O6 (sugar)

  5. Light and Pigments • Light • Visible light includes the colors of the rainbow • Pigments • Compounds that absorb specific colors of light. Absorbed colors are not visible.

  6. Visible Light Spectrum The color you see is what the object DOES NOT absorb (reflected)

  7. Chlorophyll a – Pigment that absorbs light energy • Absorbs reds and blues • Located in thylakoid membrane. Chloroplast are green because they don’t absorb green!

  8. 2. Carotenoids • Three pigments (Orange, Brown, and Yellow) that focus on absorbing blues and greens These colors are seen in the fall and in vegetables

  9. Calvin Cycle • Location: Stroma • Reactants: CO2 and ATP • Product: C6H12O6 (sugar)

  10. PHOTOSYNTHESIS OCCURS IN TWO PARTS SUMMARY LIGHT REACTIONS: Make energy in the form of ATP and e- carrier CALVIN CYCLE: Uses the ATP and e- carrier to make carbohydrates 1. Light absorption (by plant pigments) 2. Electron transport chain (making e- carrier) 3. Chemiosmosis (making ATP) 4. Calvin Cycle (making carbohydrates from CO2)

  11. Rate of photosynthesis • Photosynthesis is affected by the environment: • Light and Temperature • The rate of photosynthesis increases as light intensity increases. • Limited to a maximum rate once all available electrons are excited. • The rate of photosynthesis increases as temperature increases, over a certain range. • Rate peaks when the enzymes begin to become ineffective with increased temperature.

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