Photosynthesis

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  • It’s like passing a “hot potato” around, it loses heat as it’s passed from one to another
  • Photosynthesis

    1. 1. Photosynthesis Biology
    2. 2. Introduction <ul><li>PHOTO = light </li></ul><ul><li>SYNTHESIS = putting together </li></ul><ul><li>The synthesis of glucose (sugar) from sunlight , CO 2 , and H 2 O </li></ul><ul><li>O 2 is a waste product </li></ul><ul><li>Autotrophs (green plants, algae) trap energy from the sun and build sugars like glucose and starch. </li></ul><ul><li>** Life on earth DEPENDS on photosynthesis ** </li></ul>
    3. 3. Pigments and Sunlight <ul><li>Leaves of plants contain chlorophyll, a green colored pigment. </li></ul><ul><li>Chloros = pale green ; phyllon = leaf </li></ul><ul><li>Chlorophyll reflects green and some yellow light while it absorbs the energy of all other colors of light. </li></ul>Plants look green to us!
    4. 4. First Steps to Photosynthesis <ul><li>Chloroplasts traps energy from the sun </li></ul><ul><li>Light energy converted to chemical energy (sugar such as glucose) </li></ul><ul><li>Energy stored as starch </li></ul><ul><li>water comes from the gound and </li></ul><ul><li>CO 2 from the air </li></ul>
    5. 5. Photosynthesis Formula <ul><li>6 C O 2 + 6 H 2 O C 6 H 12 O 6 + 6 O 2 </li></ul>Sugar made here! Oxygen (O 2 ) made here!
    6. 6. Leaf structure (inside) Water from soil, roots CO 2 from air Chlorophyll Oxygen
    7. 7. Chlorophyll is in Chloroplasts in Leaves Chloroplast Photosynthesis takes place here
    8. 8. Chloroplasts Leaf X-Section
    9. 9. Real chloroplasts in algae
    10. 10. <ul><li>Two Reactions: </li></ul><ul><ul><ul><li>Light Dependent Reactions </li></ul></ul></ul><ul><ul><ul><li>Calvin Cycle </li></ul></ul></ul>
    11. 11. Light Dependent Reactions <ul><li>Water is split apart by sunlight: </li></ul>Hydrogen ( H ) H 2 O Oxygen ( O 2 )
    12. 12. Light Dependent Reactions <ul><li>Oxygen diffuses out the leaf for us to </li></ul><ul><li>breathe. </li></ul><ul><li>Hydrogen is used to make ATP’s and is also used in the Calvin Cycle to make </li></ul><ul><li>sugars like glucose and starch. </li></ul><ul><li>Hydrogen carried to </li></ul><ul><li>Calvin cycle by: </li></ul><ul><li>NADP – H “truck” </li></ul>NADP NADP Truck
    13. 13. Calvin Cycle <ul><li>Starts with a chemical the holds onto CO 2 </li></ul><ul><li>from the air. </li></ul><ul><li>An enzyme named Nabisco (opps I mean </li></ul><ul><li>Rubisco) helps to fix CO 2 from the air. </li></ul><ul><li>NADP – H drops off </li></ul><ul><li>it’s hydrogen </li></ul><ul><li>ATP is also involved </li></ul>NADP NADP
    14. 14. Start ing Compound and rubisco CO 2 H NADP truck + + + ATP’s Sugar and Starch Calvin Cycle
    15. 15. Don’t forget: Sunlight Energy to Chemical Energy to ATP’s in living things to movement, repair and transport to (Bio Work) to Heat Energy Chloroplast Mitochondrion Mr. G Food
    16. 16. THE FOOD WEB All living things depend upon the sun for energy directly and indirectly.
    17. 17. Biology is Cool !

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