Photosynthesis
Contents <ul><li>What is photosynthesis? </li></ul><ul><li>Overview </li></ul><ul><li>Where does photosynthesis occur?(Lea...
What is photosynthesis? <ul><li>The biochemical process in which sun light fixes carbon dioxide into glucose in the </li><...
Photosynthesis in Overview <ul><li>Process by which plants and other autotrophs store the energy of sunlight into sugars. ...
Where does photosynthesis occur? <ul><li>Photosynthesis occurs in the leaves of a plant. </li></ul>
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 ant...
 
Why do plants need photosynthesis ? <ul><li>Glucose is the food for the plant.  It gives the plant energy to grow. </li></...
Requirements for photosynthesis to occur . <ul><li>Light </li></ul><ul><li>Carbon  Dioxide </li></ul><ul><li>Water </li></...
Photosynthesis: The Chemical Process <ul><li>Photosynthesis is a chemical process. </li></ul><ul><li>It occurs in two main...
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>Dark reactions are t...
EQUATION   FOR   PHOTOSYNTHESIS 6CO 2  + 6H 2 O  + ENERGY C 6 H 12 O 6  + 6O 2   CARBON   DIOXIDE WATER GLUCOSE OXYGEN
How much glucose does a plant make? <ul><li>Plants make enough glucose to be used during the night and on cloudy days when...
Advantages <ul><li>Basic source of energy for all livings </li></ul><ul><li>Production of oxygen </li></ul><ul><li>Healthy...
PHOTOSYNTHESIS   AND   LIFE <ul><li>During the process of photosynthesis, oxygen is produced.  We use this oxygen to breat...
photosynthesis and respiration PHOTOSYNTHESIS CELL ACTIVITIES RESPIRATION SUN RADIANT   ENERGY GLUCOSE ATP(ENERGY)
Photosynthesis and   Respiration C 6 H 12 O 6  + GLUCOSE 6O 2 OXYGEN 6CO 2  + CARBON DIOXIDE 6H 2 O  + ENERGY WATER ATP
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Photosynthesis

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Photosynthesis

  1. 2. Photosynthesis
  2. 3. Contents <ul><li>What is photosynthesis? </li></ul><ul><li>Overview </li></ul><ul><li>Where does photosynthesis occur?(Leaf) </li></ul><ul><li>Structure of leaf </li></ul><ul><li>Why do plants need photosynthesis? </li></ul><ul><li>Requirements </li></ul><ul><li>Photosynthesis: the chemical process </li></ul><ul><li>Benefits of photosynthesis </li></ul>
  3. 4. What is photosynthesis? <ul><li>The biochemical process in which sun light fixes carbon dioxide into glucose in the </li></ul><ul><li>presence of water is </li></ul><ul><li>called photosynthesis. </li></ul>
  4. 5. Photosynthesis in Overview <ul><li>Process by which plants and other autotrophs store the energy of sunlight into sugars. </li></ul><ul><li>Requires sunlight, water, and carbon dioxide. </li></ul><ul><li>Overall equation: </li></ul><ul><li>6 CO 2 + 6 H 2 0 + sunlight  C 6 H 12 O 6 + 6 O 2 </li></ul><ul><li>Occurs in the leaves of plants in organelles called chloroplasts. </li></ul>
  5. 6. Where does photosynthesis occur? <ul><li>Photosynthesis occurs in the leaves of a plant. </li></ul>
  6. 7. 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
  7. 8. 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>
  8. 9. 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><ul><li>These pigments are embedded in the membranes of the chloroplast in groups called photosystems . </li></ul>
  9. 11. Why do plants need photosynthesis ? <ul><li>Glucose is the food for the plant. It gives the plant energy to grow. </li></ul><ul><li>They do photosynthesis to gain energy. </li></ul>
  10. 12. Requirements for photosynthesis to occur . <ul><li>Light </li></ul><ul><li>Carbon Dioxide </li></ul><ul><li>Water </li></ul><ul><li>But the most important among these is sunlight </li></ul>
  11. 13. Photosynthesis: The Chemical Process <ul><li>Photosynthesis is a chemical process. </li></ul><ul><li>It occurs in two main phases. </li></ul><ul><ul><li>Light reactions </li></ul></ul><ul><ul><li>Dark reactions (the Calvin Cycle) </li></ul></ul>
  12. 14. 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>Light reactions are the “photo” part of photosynthesis. </li></ul></ul><ul><ul><li>Light is absorbed by pigments and is transformed into ATP and NADPH molecules </li></ul></ul>
  13. 15. Dark Reactions <ul><li>Dark reactions (light-independent) occur in the stroma. </li></ul><ul><ul><li>Dark reactions are the synthesis parts of photosynthesis </li></ul></ul><ul><ul><li>Trapped energy by pigments is converted into chemical ennergy </li></ul></ul><ul><ul><li>Carbon dioxide is “fixed” into glucose </li></ul></ul><ul><ul><li>ATP and NADPH molecules created during the reaction is responsible for production of this glucose </li></ul></ul>
  14. 16. EQUATION FOR PHOTOSYNTHESIS 6CO 2 + 6H 2 O + ENERGY C 6 H 12 O 6 + 6O 2 CARBON DIOXIDE WATER GLUCOSE OXYGEN
  15. 17. How much glucose does a plant make? <ul><li>Plants make enough glucose to be used during the night and on cloudy days when they don’t get sunlight </li></ul><ul><li>The extra glucose is stored in the plant’s leaves and other parts. </li></ul>
  16. 18. Advantages <ul><li>Basic source of energy for all livings </li></ul><ul><li>Production of oxygen </li></ul><ul><li>Healthy environment </li></ul><ul><li>Lessen global warming </li></ul>
  17. 19. PHOTOSYNTHESIS AND LIFE <ul><li>During the process of photosynthesis, oxygen is produced. We use this oxygen to breathe. </li></ul>
  18. 20. photosynthesis and respiration PHOTOSYNTHESIS CELL ACTIVITIES RESPIRATION SUN RADIANT ENERGY GLUCOSE ATP(ENERGY)
  19. 21. Photosynthesis and Respiration C 6 H 12 O 6 + GLUCOSE 6O 2 OXYGEN 6CO 2 + CARBON DIOXIDE 6H 2 O + ENERGY WATER ATP

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