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Photosynthesis

Photosynthesis. Chapter 8. Photosynthesis. Reaction 6CO 2 + 6H 2 0 + light = C 6 H 12 O 6 + 6O 2 Photosynthesis uses energy from the sun to convert water and CO 2 into O 2 and high-energy sugars Occurs in the chloroplasts. CHLOROPLAST CONTENTS.

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Photosynthesis

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  1. Photosynthesis Chapter 8

  2. Photosynthesis • Reaction • 6CO2 + 6H20 + light = C6H12O6 + 6O2 • Photosynthesis uses energy from the sun to convert water and CO2 into O2 and high-energy sugars • Occurs in the chloroplasts

  3. CHLOROPLAST CONTENTS • chloroplasts contain grana (stacked plates) • grana made of thylakoids (flat plates) • colorless substance between thylakoids is stroma • Chlorophyll • Pigment made by chloroplasts • Absorbs the sun’s energy

  4. Where do the “ingredients” come from? • Water– roots • CO2– into stomata from air • Energy– from sun 6CO2 + 6H20 + light = C6H12O6 + 6O2

  5. Chloroplast • In plant cells ONLY • Contains chlorophyll, which makes it green • Thylakoid, grana, stroma

  6. Electromagnetic Spectrum

  7. Electromagnetic Spectrum

  8. ABSORPTION SPECTRUM • RED/ORANGE, BLUE, VIOLET RESPONSIBLE FOR PHOTOSYNTHESIS • CHLOROPHYLL DOES NOT ABSORB GREEN= WHY PLANTS ARE GREEN • ONLY 1% OF SUNLIGHT IS USED IN PHOTOSYNTHESIS

  9. Leaf Pigments • Leaves contain chlorophyll, carotenoid (yellow & orange), and anthocyanin (reds & purples) pigments.

  10. Paper Chromatography • Observe the different pigments in a green leaf.

  11. Chromatography animation

  12. PHOTOSYNTHESIS • 3 main events of photosynthesis: • 1) absorption of light energy • 2) conversion of light energy into chemical energy • 3) storage of chemical energy in sugars 6CO2 + 6H20 + light = C6H12O6 + 6O2

  13. AN OVERVIEW

  14. Photosynthesis • Light Reaction: Thylakoid • Dark Reaction (Calvin Cycle): Stroma

  15. Photosystems • Clusters in thylakoids that contain chlorophyll

  16. BIOCHEMISTRY OF PHOTOSYNTHESIS: LIGHT REACTION • Light Reaction- in thylakoid • 1) Light absorbed by chlorophyll pigments in photosystem II… excites electrons… electrons move down electron transport chaintophotosystem I • H2O helps this happen • Energy carriers- ATP & NADPH carry energy from light reaction to dark reaction • Oxygen is produced

  17. REVIEW: LIGHT REACTIONS • Reactants: H20, sunlight energy • Products: O2, ATP, NADPH 6CO2 + 6H20 + light = C6H12O6 + 6O2

  18. AN OVERVIEW

  19. BIOCHEMISTRY OF PHOTOSYNTHESIS: DARK REACTION • Dark reaction (Calvin Cycle)- in stroma • ATP and NADPH can’t store all their energy for a long time, so uses them to make high-energy sugars • 1) CO2 molecules enter from atmosphere… • 2) Energy from NADPH and ATP combine with carbon (from CO2) and produce glucose

  20. Review: Dark Reaction Reactants: CO2, ATP, NADPH Products: Glucose

  21. Photosynthesis Diagram • Worksheet

  22. Review: Photosynthesis • Using your text, your notes, etc… • Make a cartoon modeling the light and dark reactions of photosynthesis • This cartoon should include graphics as well as text • This should be for a student studying photosynthesis in 8th grade.

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