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Photosynthesis
Photosynthesis
Photosynthesis
Photosynthesis
Photosynthesis
Photosynthesis
Photosynthesis
Photosynthesis
Photosynthesis
Photosynthesis
Photosynthesis
Photosynthesis
Photosynthesis
Photosynthesis
Photosynthesis
Photosynthesis
Photosynthesis
Photosynthesis
Photosynthesis
Photosynthesis
Photosynthesis
Photosynthesis
Photosynthesis
Photosynthesis
Photosynthesis
Photosynthesis
Photosynthesis
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Photosynthesis

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  • So, in effect, photosynthesis is respiration run backwards powered by light. Cellular Respiration oxidize C 6 H 12 O 6  CO 2 & produce H 2 O fall of electrons downhill to O 2 exergonic Photosynthesis reduce CO 2  C 6 H 12 O 6 & produce O 2 boost electrons uphill by splitting H 2 O endergonic
  • Transcript

    • 1. 2006-2007
    • 2. Photosynthesis: Life from Light and Air 2006-2007
    • 3. Plants are energy producers
      • Like animals, plants need energy to live
      • Unlike animals, plants don’t need to eat food to make that energy
      • Plants make both food & energy
        • animals are consumers
        • plants are producers
    • 4. How do plants make energy & food?
      • Plants use the energy from the sun
        • to make ATP energy
        • to make sugars
          • glucose, sucrose, cellulose, starch, & more
      sun ATP sugars
    • 5. Building plants from sunlight & air
      • Photosynthesis
        • 2 separate processes
        • energy building reactions
          • collect sun energy
          • use it to make ATP
        • sugar building reactions
          • take the ATP energy
          • collect CO 2 from air & H 2 O from ground
          • use all to build sugars
      ATP sun sugars + carbon dioxide CO 2 sugars C 6 H 12 O 6 water H 2 O + H 2 O CO 2
    • 6. Using light & air to grow plants
      • Photosynthesis
        • using sun energy to make ATP
        • using carbon dioxide & water to make sugar
        • in chloroplast
        • allows plants to grows
        • makes a waste product
          • oxygen
      6CO 2 6H 2 O C 6 H 12 O 6 6O 2 sun energy  + + +  glucose + oxygen carbon dioxide sun energy + water + ( ATP )
    • 7. What do plants need to grow?
      • The “factory” for making energy & sugars
        • chloroplast
      • Fuels
        • sunlight
        • carbon dioxide
        • water
      • The Helpers
        • enzymes
      ATP Make ATP! Make sugar! I can do it all… And no one even notices! enzymes sun H 2 O sugars CO 2
    • 8. Photosynthesis energy building reactions sugar building reactions ATP ADP sugar sun CO 2
    • 9. Chloroplasts are only in plants animal cells plant cells
    • 10. Chloroplasts Chloroplasts in cell Leaf Leaf Chloroplast absorb sunlight & CO 2 make energy & sugar Chloroplasts contain Chlorophyll CO 2
    • 11.
      • Bring In
        • CO 2
        • H 2 O
        • light
      • Let Out
        • O 2
      • Move Around
        • sugars
      So what does a plant need? roots shoot leaves 6CO 2 6H 2 O C 6 H 12 O 6 6O 2 light energy  + + +
    • 12. Leaf Structure phloem (sugar) xylem (water) stomate guard cell palisades layer spongy layer cuticle epidermis
    • 13. Transpiration H 2 O CO 2 CO 2 O 2 H 2 O
      • gases in & out
      • water out
      O 2 xylem (water) stomate guard cell
    • 14. Transpiration
      • Water evaporates from the stomates in the leaves
        • water molecules stick to each other
        • more water is pulled up the tree
    • 15. Stomates
      • Function of stomates
        • CO 2 in
        • O 2 out
        • H 2 O out
      guard cell stomate
    • 16.  
    • 17. Xylem carry water up from roots
    • 18. Phloem: food-conducting cells
      • carry sugars around the plant wherever they are needed
        • new leaves
        • fruit & seeds
        • roots
    • 19. Putting it all together
      • Making a living…
        • sunlight
          • leaves = solar collectors
          • photosynthesis
        • gases: CO 2 in & O 2 out
          • stomates = gases in & out
        • H 2 O
          • roots take in water from soil
          • pulled up by leaf evaporation
        • nutrients
          • roots take in from soil
    • 20. How are they connected? Respiration Photosynthesis glucose + oxygen  carbon + water + energy dioxide C 6 H 12 O 6 6O 2 6CO 2 6H 2 O ATP  + + + 6CO 2 6H 2 O C 6 H 12 O 6 6O 2 light energy  + + +  glucose + oxygen carbon dioxide sun energy + water +
    • 21. Energy cycle Photosynthesis Cellular Respiration O 2 CO 2 plants animals , plants ATP H 2 O sun The Great Circle of Life! Where ’ s Mufasa? glucose
    • 22. The poetic perspective
      • All of the solid material of every plant was built out of thin air
      • All of the solid material of every animal was built from plant material
      Then all the cats, dogs, mice, people & elephants… are really strands of air woven together by sunlight! sun air
    • 23. 2006-2007 Got the energy… Ask Questions !!
    • 24. Energy needs of life
      • All life needs a constant input of energy
        • Animals = Heterotrophs
          • get their energy from “eating others”
            • eat food = other organisms = organic molecules
          • make energy through respiration
        • Plants = Autotrophs
          • get their energy from “self”
            • get their energy from sunlight
            • build organic molecules (food) from CO 2
          • make energy through photosynthesis
    • 25. How do plants live?
      • Photosynthesis
        • Energy building reactions
          • collect sun energy
          • make ATP
        • Sugar building reactions
          • use ATP for energy
          • use CO 2 as carbon for new sugars
          • build sugars
            • glucose, cellulose, starch
          • build all other organic molecules
            • proteins, lipids, carbohydrates, DNA
          • store energy for future use
            • starch in seeds & roots
    • 26.  
    • 27. Photosynthesis
      • This is the equation you are used to seeing, but this is not the whole story…
      + water + energy  glucose + oxygen carbon dioxide 6CO 2 6H 2 O C 6 H 12 O 6 6O 2 light energy  + + +

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