Plant processes photosynthesis
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Plant processes photosynthesis

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Plant processes photosynthesis Presentation Transcript

  • 1. Plant Processes: Gas Exchange and Photosynthesis
    8SCIENCE Mon. Feb. 14, 2011
  • 2. What is gas exchange in plants?
    When we inhale, we breathe in a mixture of gases we need for survival
    When we exhale, we breathe out the waste products
    In plants, CO₂ and H₂O are two substances needed for survival
    CO₂ enters through the stomata
    H₂O is absorbed through roots of the plant and released as water vapor through the stomata
  • 3. Gas Exchange
    Light, H₂O and CO₂ all affect the opening and closing of stomata
    Stomata are usually open during the day and close at night
    When stomata closes, less CO₂ can enter and less H₂O can escape
    When plants lose water vapor through stomata, this is called transpiration
  • 4. Photosynthesis
    Photosynthesis is the process in which plants use light energy to make food
    Chlorophyll is a chemical in plants that helps to capture this light energy
    Other than light, plants also need H₂O and CO₂
    These molecules combine to form an organic compound, a carbohydrate (sugar) called glucose
  • 5. Process of Photosynthesis
    6CO₂ + 6H₂O + light energy  C₆H₁₂O₆ + 6O₂
    Carbon dioxide + water + light (and chlorophyll) produces glucose and oxygen
    A plant needs 6 molecules of carbon dioxide (CO₂) and 6 molecules of water (H₂O) to make one molecule of glucose (C₆H₁₂O₆)
    The chemical bonds in glucose contain the energy the plant needs for growth and survival and is the main source of food for plants
    Oxygen is also produced during photosynthesis and released through plant stomata