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Photosynthesis ppt

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Photosynthesis ppt

  1. 1. Photosynthesis PPT <ul><li>This PowerPoint was revised June 24, 2008. </li></ul><ul><li>There is a TEKS Photosynthesis Notes handout to accompany this PPT. (This is the same handout for SM as well.) Review it for possible use in other Biology courses. </li></ul><ul><li>There is repetition in this PPT used as a learning strategy. </li></ul><ul><li>The notes section contains guides for discussion. </li></ul><ul><li>PPT is 27 slides long. </li></ul>
  2. 2. Photosynthesis PHOTOSYNTHESIS
  3. 3. What is the ultimate source of all energy?
  4. 4. How does the energy get from the sun into the foods we eat? energy energy
  5. 5. Why do we see colors? <ul><li>The sun sends downs little packets of light energy called: </li></ul><ul><li>PHOTONS </li></ul>
  6. 6. Why do we see colors? <ul><li>Photons group together in waves </li></ul><ul><li>The waves have different lengths </li></ul><ul><li>Each “wavelength” presents itself as a color </li></ul>Photons Wavelengths
  7. 7. Why do we see colors? <ul><li>Pigments absorb wavelengths of light. The wavelengths not absorbed are reflected. The colors we see are the reflected wavelengths. </li></ul>red yellow blue green orange
  8. 8. Why do we see colors? <ul><li>What color is chlorophyll? </li></ul><ul><li>What colors of light would a plant with purple leaves absorb? </li></ul>The plant pigment chlorophyll reflects light in these wavelengths. The plant pigment chlorophyll absorbs the red and blue colors of light so these colors are not seen.
  9. 9. What colors are being absorbed and what colors are being reflected? Flowers from Clip Art
  10. 10. Chloroplast Structure <ul><li>Chlorophyll pigments are in structures called chloroplasts . </li></ul>Disks called GRANA contain the pigment CHLOROPHYLL. The liquid portion of a chloroplast is the STROMA
  11. 11. <ul><li>Where do </li></ul><ul><li>we find </li></ul><ul><li>chloroplasts? </li></ul>
  12. 12. Cross-section of a Leaf <ul><li>Chloroplasts are found in cells of leaves. </li></ul>stoma (stomata) Cells containing chloroplast with chlorophyll inside
  13. 13. Review <ul><li>What is the ultimate source of all energy? </li></ul><ul><li>In what form does light energy come to the earth? </li></ul><ul><li>What compounds absorbs wavelengths? </li></ul><ul><li>How do we see colors? </li></ul>
  14. 14. Review <ul><li>Which compound reflects the green wavelengths thereby making plants green? </li></ul><ul><li>Where would we find this compound? </li></ul><ul><li>Where in a leaf do we find pigments? </li></ul><ul><li>What are the small openings in leaves for gas exchange called? </li></ul>
  15. 15. How do Plants Make Food? <ul><li>What process captures the light energy and uses it to make food? </li></ul>
  16. 16. <ul><li>overview of photosynthesis </li></ul>OVERVIEW OF PHOTOSYNTHESIS PLANTS TAKE IN CO 2 AND H 2 O PLANTS MAKE GLUCOSE AND OXYGEN SUNLIGHT PROVIDES THE ENERGY FOR PHOTOSYNTHESIS light SUNLIGHT CAPTURED BY CHLOROPHYLL water carbon dioxide carbohydrates oxygen
  17. 17. Photosynthesis <ul><li>What is photosynthesis? </li></ul><ul><li>Photosynthesis is the process by which: </li></ul>water carbon dioxide oxygen glucose TAKE IN AND USING MAKE PLANTS (producers) light chlorophyll
  18. 18. Photosynthesis <ul><li>2 Phases: </li></ul><ul><ul><li>Light reactions </li></ul></ul><ul><ul><li>Dark reactions (aka Calvin cycle) </li></ul></ul>Light Reaction Dark Reaction
  19. 19. Who was Calvin anyway? <ul><li>A member of the faculty at UC Berkeley since 1937, Melvin Calvin received the 1961 Nobel prize in chemistry for identifying the path of carbon in photosynthesis. </li></ul><ul><li>The cycle of reactions in the dark phase of photosynthesis was named after him for his work in identifying the processes taking place. </li></ul>
  20. 20. Photosynthesis <ul><li>Light reaction: </li></ul><ul><ul><li>Occurs in the grana </li></ul></ul><ul><ul><li>Must have light </li></ul></ul>light Light Reaction Dark Reaction LIGHT REACTION Dark Reaction grana (chlorophyll)
  21. 21. Photosynthesis <ul><li>Dark reactions (aka Calvin cycle): </li></ul><ul><ul><li>Occurs in the stroma </li></ul></ul><ul><ul><li>Occurs in the light and dark </li></ul></ul>Light Reaction Dark Reaction Light Reaction DARK REACTION stroma (liquid)  
  22. 22. Step 1: Light Reactions O 2 O 2 O 2 O 2 O 2 How does the O 2 leave the leaf? light energy reacts with the chlorophyll water is split by the light energy H is kept for the dark reaction O 2 is released O H 2 H 2 O H H ENERGY
  23. 23. Step 1: Light Reactions <ul><li>In the early 1600’s Van Helmont did an experiment that showed plants get vital growth substances from water. </li></ul>H 2 O ENERGY
  24. 24. Step 2: Dark Reactions <ul><li>AKA: CALVIN CYCLE </li></ul>CO 2 CO 2 CO 2 CO 2 H How does CO 2 enter the plant? H from the water split in the light reaction is present CO 2 enters the chloroplast the reactants H and CO 2 combine H glucose is the product <ul><li>Other carbohydrates besides glucose may be made in photosynthesis </li></ul>C 6 H 12 O 6 H + CO 2
  25. 25. Photosynthesis Review <ul><li>Light reactions: H 2 O split into H 2 + O </li></ul><ul><li>Dark reactions: H + CO 2 = C 6 H 12 O 6 </li></ul>H 2 O CO 2 C 6 H 12 O 6 O 2 chlorophyll Light Reaction Dark Reaction
  26. 26. Photosynthesis Formula <ul><li>How would this be written as a chemical equation? </li></ul><ul><li>What goes in ? (the reactants ) </li></ul><ul><li>What comes out ? (the products ) </li></ul>H 2 O CO 2 C 6 H 12 O 6 O 2 H 2 O Light Reaction Dark Reaction CO 2 C 6 H 12 O 6 O 2 chlorophyll
  27. 27. Photosynthesis Formula <ul><li>What’s wrong with this equation? </li></ul><ul><li>The number of atoms is not equal on both sides of the equation. </li></ul><ul><li>Balance the equation so that the number of atoms of each element is equal on both sides. </li></ul>6 6 6 (1) <ul><li>Now balance it as if TWO glucose molecules were being produced. </li></ul>H 2 O CO 2 C 6 H 12 O 6 O 2 one carbon atom reactant 6 carbon atoms product
  28. 28. TRY THIS! <ul><li>Think-Pair-Share </li></ul><ul><li>Analyze the relationship between photosynthesis, biogeochemical cycles, and food chains. </li></ul>
  29. 29. Photosynthesis Review <ul><li>What goes in? (the reactants) </li></ul><ul><li>What comes out? (the products) </li></ul>H 2 O Light Reaction Dark Reaction CO 2 C 6 H 12 O 6 O 2 chlorophyll <ul><li>6CO 2 + 6H 2 O 6O 2 + C 6 H 12 O 6 </li></ul>light chlorophyll
  30. 30. Work Cited <ul><ul><li>Melvin Calvin picture. Online image </li></ul></ul><ul><ul><li>http://www.lbl.gov/Science-Articles/Archive/Melvin-Calvin-obit.html </li></ul></ul>

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