Photosynthesis

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Photosynthesis

  1. 1. Created by:Arlene Jane B. Jayawon
  2. 2. Photosynthesis, process by which green plantsand certain other organisms use the energy oflight to convert carbon dioxide and water into thesimple sugar glucose. In sodoing, photosynthesis provides the basic energysource for virtually all organisms. An extremelyimportant byproduct of photosynthesis isoxygen, on which most organisms depend. Next
  3. 3. I. IntroductionPhotosynthesis occurs in green plants, seaweeds, algae, andcertain bacteria. These organisms are veritable sugarfactories, producing millions of new glucose molecules persecond. Plants use much of this glucose, a carbohydrate, asan energy source to build leaves, flowers, fruits, and seeds.They also convert glucose to cellulose, the structural materialused in their cell walls. Most plants produce more glucosethan they use, however, and they store it in the form of starchand other carbohydrates in roots, stems, and leaves. Theplants can then draw on these reserves for extra energy orbuilding materials. Each year, photosynthesizing organismsproduce about 170 billion metric tons of extracarbohydrates, about 30 metric tons for every person on earth. Next
  4. 4. I. IntroductionPhotosynthesis has far-reaching implications. Likeplants, humans and other animals depend on glucose as anenergy source, but they are unable to produce it on their ownand must rely ultimately on the glucose produced by plants.Moreover, the oxygen humans and other animals breathe is theoxygen released during photosynthesis. Humans are alsodependent on ancient products of photosynthesis, known asfossil fuels, for supplying most of our modern industrial energy.These fossil fuels, including natural gas, coal, andpetroleum, are composed of a complex mix of hydrocarbons, theremains of organisms that relied on photosynthesis millions ofyears ago. Thus, virtually all life on earth, directly orindirectly, depends on photosynthesis as a source offood, energy, and oxygen, making it one of the most importantbiochemical processes known. Pleas click to go back to the category
  5. 5. II. Where Photosynthesis occurs
  6. 6. III. How Photosynthesis works
  7. 7. A. The Light-Depend Reaction
  8. 8. A. The Light-Depend Reaction
  9. 9. A. The Light-Depend Reaction
  10. 10. A. The Light-Depend Reaction
  11. 11. A. The Light-Depend Reaction
  12. 12. B. The Light-Independ reaction
  13. 13. B. The Light-Independ Reaction
  14. 14. IV. Photosynthesis variations
  15. 15. IV. Photosynthesis variationsBacteria lack chloroplasts, and instead use structures calledchromatophores—membranes formed by numerous foldingsof the plasma membrane, the membrane surrounding thefluid, or cytoplasm, that fills the cell. The chromatophoreshouse thylakoids similar to plant thylakoids, which in somebacteria contain chlorophyll. For these bacteria, the processof photosynthesis is similar to that of plants, algae, andseaweed. Many of these chlorophyll-containing bacteria areabundant in oceans, lakes, and rivers, and the oxygen theyrelease dissolves in the water and enables fish and otheraquatic organisms to survive. Next
  16. 16. IV. Photosynthesis variations Certain archaebacteria, members of a group of primitive bacteria-like organisms, carry out photosynthesis in a different manner. The mud-dwelling green sulfur and purple sulfur archaebacteria use hydrogen sulfide instead of water in photosynthesis. These archaebacteria release sulfur rather than oxygen, which, along with hydrogen sulfide, imparts the rotten egg smell to mudflats. Halobacteria, archaebacteria found in the salt flats of deserts, rely on the pigment bacteriorhodopsin instead of chlorophyll for photosynthesis. These archaebacteria do not carry out the complete process of photosynthesis; although they produce ATP in a process similar to the light-dependent reaction and use it for energy, they do not produce glucose. Halobacteria are among the most ancient organisms, and may have been the starting point for the evolution of photosynthesis. While it may seem that we understand photosynthesis in detail, decades of experiments have given us only a partial understanding of this important process. A more thorough understanding of the details of photosynthesis may pave the way for development of crops that are more efficient at using the sun’s energy, producing food for increasingly bountiful harvests.  Next
  17. 17. Sorry try Again!!!!!!
  18. 18. Congratulations!!!!!!!
  19. 19. Sorry try Again!!!!!!
  20. 20. Congratulations!!!!!!!
  21. 21. Nice Try!!!!!!
  22. 22. You Got It!!!!!!
  23. 23. Sorry,wrong answer!!!!!
  24. 24. Yehey,correct answer!!!!!
  25. 25. Question No.55.__________ are among the most ancient organism,and may have been the starting point for the evolution of photosynthesis.A.Electrons C.BisphosphateB.Halobacteria D.Stroma
  26. 26. Try again!!!!!!
  27. 27. Correct Answer!!!!!!

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