<ul><li>What is photosynthesis? </li></ul>
Photosynthesis  is the process of converting light energy to chemical energy and storing it in the bonds of sugar. This pr...
 
Leaf Structure <ul><li>Most photosynthesis occurs in the  palisade  layer. </li></ul><ul><li>Gas exchange of CO 2  and O 2...
Chloroplast Structure <ul><li>Inner membrane called the  thylakoid  membrane. </li></ul><ul><li>Thickened regions called  ...
Pigments <ul><li>Chlorophyll A is the most important photosynthetic pigment.  </li></ul><ul><li>Other pigments called ante...
<ul><li>The combination of all of the pigments  increases the range of colors that plants can use in photosynthesis. </li>...
Photosynthesis: The Chemical Process <ul><li>Occurs in two main phases. </li></ul><ul><ul><li>Light reactions </li></ul></...
Light Reactions <ul><li>Light-dependent reactions occur on the thylakoid membranes. </li></ul><ul><ul><li>Light and water ...
Dark Reactions <ul><li>Dark reactions (light-independent) occur in the stroma. </li></ul><ul><ul><li>Carbon dioxide is “fi...
Review time! <ul><li>Think – Pair - Share </li></ul>
Question <ul><li>What is the main photosynthetic pigment? </li></ul><ul><li>What do accessory pigments help with in photos...
<ul><li>What part of the plant does photosynthesis occur in?  </li></ul><ul><li>Mainly in the  leaves . Some may occur in ...
Question <ul><li>3.  Organisms  that carry out  </li></ul><ul><li>photosynthesis making their own  </li></ul><ul><li>organ...
<ul><li>Which color is not absorbed in photosynthesis? </li></ul>
<ul><li>Energy is stored in the form of __________? </li></ul>
<ul><li>Energy is stored in ADP when what occurs? </li></ul><ul><li>Its released from ATP when what occurs? </li></ul>
<ul><li>A scientist is collecting gas given off by a plant in a forest. Which gas is this? </li></ul>
<ul><li>Plants absorb sunlight in _____________ (be specific) </li></ul>
<ul><li>Where do light reactions take place? </li></ul>
<ul><li>Where does the Calvin Cycle take place? </li></ul>
<ul><li>What does light energy do to chlorophyll molecules? </li></ul>
<ul><li>A fish tank is sealed completely so that it is air tight ( There is no gas exchange from inside to out or vice ver...
 
FUN FACT
<ul><li>What do autumn leaves and ripening bananas have in common? </li></ul><ul><li>The  green  color in unripe bananas c...
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Photosynthesis review

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Photosynthesis review

  1. 1. <ul><li>What is photosynthesis? </li></ul>
  2. 2. Photosynthesis is the process of converting light energy to chemical energy and storing it in the bonds of sugar. This process occurs in plants and some algae. Photosynthesis requires only… <ul><li>light energy , CO2 , and H2O to make sugar and oxygen gas . </li></ul><ul><li>6H 2 O + 6CO 2 ----------> C 6 H 12 O 6 + 6O 2 </li></ul><ul><li>Water Carbon Dioxide Sugar Oxygen </li></ul>
  3. 4. Leaf Structure <ul><li>Most photosynthesis occurs in the palisade layer. </li></ul><ul><li>Gas exchange of CO 2 and O 2 occurs at openings called stomata surrounded by guard cells on the lower leaf surface. </li></ul>Palisade Spongy
  4. 5. Chloroplast Structure <ul><li>Inner membrane called the thylakoid membrane. </li></ul><ul><li>Thickened regions called thylakoids . A stack of thylakoids is called a granum . (Plural – grana) </li></ul><ul><li>Stroma is a liquid surrounding the thylakoids. </li></ul>
  5. 6. Pigments <ul><li>Chlorophyll A is the most important photosynthetic pigment. </li></ul><ul><li>Other pigments called antenna or accessory pigments are also present in the leaf. </li></ul><ul><ul><li>Chlorophyll B </li></ul></ul><ul><ul><li>Carotenoids (orange / red) </li></ul></ul><ul><ul><li>Xanthophylls (yellow / brown) </li></ul></ul>
  6. 7. <ul><li>The combination of all of the pigments increases the range of colors that plants can use in photosynthesis. </li></ul>
  7. 8. Photosynthesis: The Chemical Process <ul><li>Occurs in two main phases. </li></ul><ul><ul><li>Light reactions </li></ul></ul><ul><ul><li>Dark reactions (aka – the Calvin Cycle) </li></ul></ul><ul><li>Light reactions are the “photo” part of photosynthesis. Light is absorbed by pigments. </li></ul><ul><li>Dark reactions are the “synthesis” part of photosynthesis. Trapped energy from the sun is converted to the chemical energy of sugars. </li></ul>
  8. 9. Light Reactions <ul><li>Light-dependent reactions occur on the thylakoid membranes. </li></ul><ul><ul><li>Light and water are required for this process. </li></ul></ul><ul><ul><li>Energy storage molecules are formed. (ATP and NADPH) </li></ul></ul><ul><ul><li>Oxygen gas is made as a waste product. </li></ul></ul>
  9. 10. Dark Reactions <ul><li>Dark reactions (light-independent) occur in the stroma. </li></ul><ul><ul><li>Carbon dioxide is “fixed” into the sugar glucose. </li></ul></ul><ul><ul><li>ATP and NADPH molecules created during the light reactions power the production of this glucose. </li></ul></ul>
  10. 11. Review time! <ul><li>Think – Pair - Share </li></ul>
  11. 12. Question <ul><li>What is the main photosynthetic pigment? </li></ul><ul><li>What do accessory pigments help with in photosynthesis? </li></ul>
  12. 13. <ul><li>What part of the plant does photosynthesis occur in? </li></ul><ul><li>Mainly in the leaves . Some may occur in green stems also. </li></ul>
  13. 14. Question <ul><li>3. Organisms that carry out </li></ul><ul><li>photosynthesis making their own </li></ul><ul><li>organic molecules are called________. </li></ul>
  14. 15. <ul><li>Which color is not absorbed in photosynthesis? </li></ul>
  15. 16. <ul><li>Energy is stored in the form of __________? </li></ul>
  16. 17. <ul><li>Energy is stored in ADP when what occurs? </li></ul><ul><li>Its released from ATP when what occurs? </li></ul>
  17. 18. <ul><li>A scientist is collecting gas given off by a plant in a forest. Which gas is this? </li></ul>
  18. 19. <ul><li>Plants absorb sunlight in _____________ (be specific) </li></ul>
  19. 20. <ul><li>Where do light reactions take place? </li></ul>
  20. 21. <ul><li>Where does the Calvin Cycle take place? </li></ul>
  21. 22. <ul><li>What does light energy do to chlorophyll molecules? </li></ul>
  22. 23. <ul><li>A fish tank is sealed completely so that it is air tight ( There is no gas exchange from inside to out or vice versa). There is an elodea plant inside the tank. Will the fish survive? Explain your answer. </li></ul>
  23. 25. FUN FACT
  24. 26. <ul><li>What do autumn leaves and ripening bananas have in common? </li></ul><ul><li>The green color in unripe bananas comes from chlorophyll; the same pigment that gives green leaves their color. As bananas ripen, the chlorophyll breaks down & disappears , revealing the yellow color, which has been there all along. </li></ul><ul><li>The yellows & oranges of autumn leaves are also revealed as their chlorophyll breaks down . Of course, other changes also occur as bananas ripen: the starches change to sugar and the flesh softens as pectin (a carbohydrate) breaks down. </li></ul>

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