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Photosynthesis Presentation Transcript

  • 1. Photosynthesis
  • 2. Photosynthesis
  • 3. The Photosynthesis Equation 6 CO 2    +   6 H 2 O +  sunlight    C 6 H 12 O 6   +  6 O 2  Carbon Dioxide + Water + Light Energy    sugar + oxygen
    • What is it? 
    • Plants use energy from the sun to convert carbon dioxide and water into oxygen and sugars.
    • Plants use some of the sugar for food. The cells break down the sugar molecules to release the energy they contain.
    • Where does it happen?
    • In chloroplasts: Some sugar molecules are converted into other compounds like cellulose. Other sugar molecules may be stored for later use.
    • When you eat food made by plants, like carrots or potatoes, you are eating the plant's stored energy.
    • Which organisms use it?
    • Plants (land or water) and phytoplankton
    • What do we call organisms that make their own food?
    • Producers or “autotrophs”
  • 4. The Two Stages of Photosynthesis Stage 1: Capturing the Sun's Energy
    • What happens in stage 1? 
    • Chloroplasts are green organelles inside plant cells. 
    • The green color comes from pigments, colored chemical compounds that absorb light.
    • The main photosynthetic pigment in chloroplasts is chlorophyll. 
    • Chlorophyll captures light energy and uses it to power the second stage of photosynthesis.
  • 5. The Two Stages of Photosynthesis Stage 2: Using Energy to Make Food
    • What happens in stage 2? 
    • Roots absorb the water and stomata absorbs the carbon dioxide .
    • Stomata are small openings in the underside of leaves.
    • water and carbon dioxide in the leaves moves into the chloroplasts.
    • Chloroplasts use the water and carbon dioxide and with the energy from the 1st stage, undergo a series of chemical reactions.
    • The reactions produce products:
      • sugar that has 6 carbon atoms. Sugars are a type of carbohydrate. Cells can use the energy in sugar to carry out important cell functions.
      • oxygen , which leaves the leaf through the stomata.
    • Almost all the oxygen in the Earth's atmosphere is produced through photosynthesis.
  • 6. Cellular Respiration
  • 7. Cellular Respiration C 6 H 12 O 6   +  6 O 2 6 CO 2    +  6 H 2 O + Energy (ATP)   sugar + oxygen Carbon Dioxide + Water + Chemical Energy
    • What is it? 
    • cells use oxygen to release energy stored in sugars, like glucose
    • Where does it happen?
    • in organelles called mitochondria
    • Which organisms use it?
    • Plant AND animal cells both have mitochondria
  • 8. Two Stages of Cellular Respiration Stage 1: Happens where? in the Cytoplasm
    • What happens in stage 1? 
    • Glucose in the cytoplasm is broken down into smaller molecules, releasing energy
    • Smaller molecules move into the mitochondria
  • 9. Two Stages of Cellular Respiration Stage 2: Happens where? in the Mitochondria
    • What happens in stage 2? 
    • Smaller molecules (glucose break-down products) move into the mitochondria.
    • Oxygen enters the cell & goes into the mitochondria.
    • As the smaller molecules are broken down even further, hydrogen is released in a way that allows cells to capture energy in a usable form. The hydrogen combines with oxygen to make water .
    • Products: energy, carbon dioxide, and water .
    • Some of the energy is transferred to other molecules, which carry the energy where it is needed for the activities of the cell.
    • Remaining energy is released as heat.
    • Carbon dioxide formed during cellular respiration is released by the cell.
  • 10.