Picture Guide to Chapter 8 Photosynthesis
8-1 Energy and Life
Objectives <ul><li>Explain where plants get the energy they need to produce food </li></ul><ul><li>Describe the role of AT...
Q: Where does energy come from? <ul><li>A: Our food, but originally the energy in food comes from the sun </li></ul>
Autotrophs <ul><li>Make their own food </li></ul>
Heterotrophs <ul><li>Cannot make their own food </li></ul>
Chemical Energy and ATP <ul><li>The principal chemical compounds that cells use to store and release energy is called  ATP...
Storing Energy <ul><li>ATP stores energy in the third phosphate </li></ul><ul><li>ATP is like a fully charged battery </li...
Releasing Energy <ul><li>Q: How is the energy in ATP released? </li></ul><ul><li>A: Break bond between the second and 3 rd...
 
 
Using Biomechanical Energy <ul><li>Active Transport </li></ul><ul><li>Movement of organelles throughout cell </li></ul><ul...
ATP Availability <ul><li>Most cells only have enough ATP for a few seconds of activity </li></ul><ul><li>Why? </li></ul><u...
8-2 Photosynthesis:   An Overview
Photosynthesis <ul><li>The process in which plants use the energy of sunlight to convert water and carbon dioxide into hig...
Photosynthesis
The Photosynthesis Equation CO 2 + H 2 O + C 6 H 12 O 6 O 2 light (Carbon Dioxide) (Water) (Sun) (Glucose) (Oxygen)
 
Chlorophyll <ul><li>The plants principal pigment, absorbs light energy in the blue-violet and red spectrum of visible ligh...
Absorption of Light by Chlorophyll  a  and Chlorophyll  b Absorption of Light by Chlorophyll  a  and Chlorophyll  b V B G ...
Because light is a form of energy… <ul><li>Anything that absorbs light also absorbs the energy from that light </li></ul><...
8-3 The Reactions of Photosynthesis
 
Thylakoids <ul><li>Sac-like photosynthetic membranes arranged in stacks </li></ul>
Grana <ul><li>Stacks of thylakoids </li></ul>
Stroma <ul><li>The region outside the thylakoid </li></ul>
Scientists describe the reactions of photosynthesis in two parts <ul><li>Light – dependent reactions (takes place in the t...
 
Carrier Molecule <ul><li>Compound that can accept a pair of high energy electrons and transfer them along with most of the...
 
Q: What does this do? <ul><li>NADP+  NADPH  </li></ul><ul><li>A: this traps sunlight in chemical  form </li></ul>
Light Dependent Reactions <ul><li>Uses energy from light to produce </li></ul><ul><li>Oxygen gas </li></ul><ul><li>ATP </l...
 
 
 
The Calvin Cycle <ul><li>The ATP and NADPH formed by the light-dependent reactions contain an abundance of chemical energy...
The Calvin Cycle <ul><li>These reactions don’t require light, therefore these reactions are called </li></ul><ul><li>Light...
 
 
Factors Affecting Photosynthesis <ul><li>Not enough water </li></ul><ul><li>Temperature  </li></ul><ul><li>Light intensity...
THE END
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Biology - Chp 8 - Photosynthesis - PowerPoint

  1. 1. Picture Guide to Chapter 8 Photosynthesis
  2. 2. 8-1 Energy and Life
  3. 3. Objectives <ul><li>Explain where plants get the energy they need to produce food </li></ul><ul><li>Describe the role of ATP in cellular activities </li></ul>
  4. 4. Q: Where does energy come from? <ul><li>A: Our food, but originally the energy in food comes from the sun </li></ul>
  5. 5. Autotrophs <ul><li>Make their own food </li></ul>
  6. 6. Heterotrophs <ul><li>Cannot make their own food </li></ul>
  7. 7. Chemical Energy and ATP <ul><li>The principal chemical compounds that cells use to store and release energy is called ATP adenosine triphosphate </li></ul>
  8. 8. Storing Energy <ul><li>ATP stores energy in the third phosphate </li></ul><ul><li>ATP is like a fully charged battery </li></ul>
  9. 9. Releasing Energy <ul><li>Q: How is the energy in ATP released? </li></ul><ul><li>A: Break bond between the second and 3 rd phosphates </li></ul>ADP 2
  10. 12. Using Biomechanical Energy <ul><li>Active Transport </li></ul><ul><li>Movement of organelles throughout cell </li></ul><ul><li>Sythesis of proteins and nucleic acids </li></ul><ul><li>Produce light </li></ul><ul><ul><li>Blink of firefly caused by an enzyme powered by ATP </li></ul></ul>
  11. 13. ATP Availability <ul><li>Most cells only have enough ATP for a few seconds of activity </li></ul><ul><li>Why? </li></ul><ul><ul><li>Not good at storing energy over the long term </li></ul></ul><ul><ul><li>Glucose stores 90 times the chemical energy of ATP </li></ul></ul><ul><ul><li>Cells generate ATP from ADP as needed by using the energy in foods like glucose </li></ul></ul>
  12. 14. 8-2 Photosynthesis: An Overview
  13. 15. Photosynthesis <ul><li>The process in which plants use the energy of sunlight to convert water and carbon dioxide into high energy carbohydrates – sugars and starches – and oxygen as a waste product </li></ul>
  14. 16. Photosynthesis
  15. 17. The Photosynthesis Equation CO 2 + H 2 O + C 6 H 12 O 6 O 2 light (Carbon Dioxide) (Water) (Sun) (Glucose) (Oxygen)
  16. 19. Chlorophyll <ul><li>The plants principal pigment, absorbs light energy in the blue-violet and red spectrum of visible light </li></ul>
  17. 20. Absorption of Light by Chlorophyll a and Chlorophyll b Absorption of Light by Chlorophyll a and Chlorophyll b V B G Y O R Chlorophyll b Chlorophyll a
  18. 21. Because light is a form of energy… <ul><li>Anything that absorbs light also absorbs the energy from that light </li></ul><ul><li>When chlorophyll absorbs light, much of the energy is transferred to electrons in the chlorophyll molecule, raising the energy level of these electrons </li></ul><ul><li>These high-energy electrons make photosynthesis work </li></ul>
  19. 22. 8-3 The Reactions of Photosynthesis
  20. 24. Thylakoids <ul><li>Sac-like photosynthetic membranes arranged in stacks </li></ul>
  21. 25. Grana <ul><li>Stacks of thylakoids </li></ul>
  22. 26. Stroma <ul><li>The region outside the thylakoid </li></ul>
  23. 27. Scientists describe the reactions of photosynthesis in two parts <ul><li>Light – dependent reactions (takes place in the thylakoid membranes) </li></ul><ul><li>Light – independent reactions (takes place in stroma) </li></ul>
  24. 29. Carrier Molecule <ul><li>Compound that can accept a pair of high energy electrons and transfer them along with most of their energy to another molecule </li></ul><ul><li>Ex.) NADP+ </li></ul>
  25. 31. Q: What does this do? <ul><li>NADP+ NADPH </li></ul><ul><li>A: this traps sunlight in chemical form </li></ul>
  26. 32. Light Dependent Reactions <ul><li>Uses energy from light to produce </li></ul><ul><li>Oxygen gas </li></ul><ul><li>ATP </li></ul><ul><li>NADPH </li></ul>
  27. 36. The Calvin Cycle <ul><li>The ATP and NADPH formed by the light-dependent reactions contain an abundance of chemical energy, but they are not stable enough to store that energy for more than a few minutes. </li></ul><ul><li>The Calvin cycle uses ATP and NADPH from light – dependent reactions to produce high energy sugars </li></ul>
  28. 37. The Calvin Cycle <ul><li>These reactions don’t require light, therefore these reactions are called </li></ul><ul><li>Light – independent reactions </li></ul>
  29. 40. Factors Affecting Photosynthesis <ul><li>Not enough water </li></ul><ul><li>Temperature </li></ul><ul><li>Light intensity </li></ul>
  30. 41. THE END

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