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Energy from Sunlight

Energy from Sunlight. Biology – Exploring Life - Chapter 8. The Carbon Cycle. Human CO2 emissions http :// www.skepticalscience.com/human-co2-smaller-than-natural-emissions.htm Photosynthesis Overview http://www.teachersdomain.org/resource/tdc02.sci.life.stru.photosynth/

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Energy from Sunlight

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  1. Energy from Sunlight Biology – Exploring Life - Chapter 8

  2. The Carbon Cycle

  3. Human CO2 emissions • http://www.skepticalscience.com/human-co2-smaller-than-natural-emissions.htm • Photosynthesis Overview • http://www.teachersdomain.org/resource/tdc02.sci.life.stru.photosynth/ • A different kind of fuel • http://www.teachersdomain.org/resource/vtl07.la.ws.process.diffuel/

  4. Hydrothermal Vents – Life without light National geographic • http://www.youtube.com/watch?v=XotF9fzo4Vo Life in other planets/moons • http://www.youtube.com/watch?v=4QqmUBbfn6Y • http://science.nasa.gov/science-news/science-at-nasa/2001/ast13apr_1/ • http://wwf.panda.org/about_our_earth/blue_planet/deep_sea/vents_seeps/ David Attenborough • http://www.youtube.com/watch?v=BXGF3XS-yAI

  5. As in cellular respiration, the chemical equation for photosynthesis summarizes several reaction steps

  6. Overall equation for photosynthesis CHLOROPLAST

  7. http://upload.wikimedia.org/wikipedia/commons/thumb/9/90/Leaf_anatomy.svg/769px-Leaf_anatomy.svg.pnghttp://upload.wikimedia.org/wikipedia/commons/thumb/9/90/Leaf_anatomy.svg/769px-Leaf_anatomy.svg.png

  8. The two main stages of photosynthesis are: the light reactions, which occur in the thylakoids, and the Calvin cycle (light independent reactions), which occurs in the stroma

  9. Different forms of electromagnetic energy have different wavelengths. Shorter wavelengths have more energy than longer wavelengths

  10. Absorbed light A substance’s color is due to chemical compounds called pigments

  11. Types of pigments in plants • Chlorophyll a: Absorbs mainly blue-violet and red light and reflects mainly green light • Chlorophyll b: Absorbs mainly blue and orange light and reflects yellow-green • Carotenoids: Absorb mainly blue-green light and reflect yellow-orange.

  12. Harvesting Light Energy - Photosystems

  13. Photosystem model • Chlorophyll 1 • Chlorophyll 2 • Chlorophyll 3 (Reaction-center Chlorophyll) • Primary Electron Acceptor • Water Molecule • Light source

  14. The light energy boosts the electrons up to their excited states

  15. The Calvin Cycle

  16. By converting light energy to chemical energy, photosynthesis is the first step in the flow of energy through an ecosystem.

  17. Photosynthesis Table

  18. Photosynthesis Table

  19. Snail & elodea Investigation • Bromylthymol blue is blue in the absence of CO2 and is yellow to clear when CO2 is present. • Do snails give off CO2? • Do snails give off CO2 in the dark? • Does elodea give off CO2? • Does elodea give off CO2 in the dark?

  20. ELODEA, SNAILS, & CO2 DARK LIGHT

  21. Analysis questions • How do snails affect the level of CO2 in the test tubes? • How does Elodea affect the level of CO2 in the test tubes? • What is the purpose of test tube #4? • Which of the test tubes is an example of a balance system? Why? • How do you explain the difference in color (if any) between the test tubes kept under the light, and the ones in the dark? (Compare #1in the light with #1in the dark, and so on)

  22. IN THE LIGHT IN THE DARK

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