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Photosynthesis

This lesson covers the essential process of photosynthesis, emphasizing the light-dependent and light-independent reactions. Students will learn about chlorophyll and chloroplasts and the significance of this process for green plants, which are vital to human existence. Key activities include completing a diagram of the photosynthesis reaction and memorizing the balanced equation. Insights into the electron transport chain and the Calvin Cycle highlight how energy in the form of ATP is created. Overall, the lesson underscores the foundational role of photosynthesis in sustaining life on Earth.

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Photosynthesis

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Presentation Transcript

  1. Photosynthesis Do Now: Complete the diagram below & balance the reaction

  2. Just know it. • Commit the balanced photosynthesis reaction to memory.

  3. The Basics • Chlorophylls and other pigments are chemicals that absorb light energy in phototrophs.

  4. Chloroplasts • In most eukaryotes, organelles called chloroplasts are where photosynthesis happens

  5. There’s more than 1 way to split a water molecule • The details of photosynthesis vary between groups of organisms. • The photosynthetic processes we will study in most detail is that of green plants, because they are most important to human activity. • As usual, bacteria do some crazy biochemistry!

  6. A 2-step Process • The light-dependent reactions capture light energy and supply it to the light-independent reactions, which build carbohydrates

  7. Light-Dependent Reactions • Water is split by light energy • Water is the electron donor for photosynthesis in green plants

  8. Electron Transport • The electrons then flow from a high energy state to lower ones in a series of steps. • That flow of electrons provides the energy to make ATP

  9. Light-Independent Reactions • The Calvin Cycle is the light-independent (or “dark”) reaction of green plants. • Carbon fixation, which is the conversion of inorganic carbon into organic carbon, is its function.

  10. Who Cares? • http://www.youtube.com/watch?v=4DRIg-K6kZs&feature=player_embedded • The future is green.

  11. Recap • Photosynthesis provides almost all of the energy to all living things on Earth. • Sounds important.

  12. Related Reading • “Where do the Atoms Go in Photosynthesis” • pp. 143-145 • There is no written assignment, but you are expected to read.

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