Gas Exchange- Flowering Plants

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  • Created by: Haeinh
  • Created on: 26-07-16 19:46
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  • Gas Exchange (Flowering Plants)
    • What is Gas Exchange?
      • required for two critical processes
        • Photosythesis
          • Process in which green plants produce glucose
            • Plants take in  CO2 + Water + minerals from surrondings
              • Converts To
                • Sugar (Glucose) + O2
          • Details
            • Gas In- CO2 Gas Out- O2
            • Time- Daytime Only (requires sun)
            • CO2 + H2O  ---------->(light energy +chlorophyll) ----------->    Glucose + O2
              • Plants take in  CO2 + Water + minerals from surrondings
                • Converts To
                  • Sugar (Glucose) + O2
              • Requires Radiant Energy
                • Time- Daytime Only (requires sun)
              • (O2 waste product)
        • Respiration
          • Details
            • Gas In - O2           Gas Out- CO2       (+ Water Vapour)
              • (CO2 waste  product)
            • Time- All times
            • Glucose +O2 =             CO2 + H2O + Energy
          • Release of energy from glucose- takes place in every cell
            • All cells need to respire to produce the energy plants need
    • Diffusion
    • Efficient Adaptions
      • Structure Of Leaf
        • Large Surface Area
          • Naturally  broad = lots area for diffusion
        • Thin In Size
          • Gases only have to travel short distance to reach needed cells.
        • Air Spaces Inside Leaf - Spongy Mesophyll Layer
          • Lets gases like O2 and CO2 move easier between cells
            • Also increases surface area for gas exchange
        • Presence Of Stomata (Stoma)
          • Little holes in the lower surface
          • Role
            • Lets gases like CO2 and O2 diffuse in/out
              • Open/Close  controlled by guard cells surrounding them
                • Stomata close in dark
                  • Photosynthesis can't happen in the dark- no need to let in CO2
                • When Closed- water can't escape
  • Stomata open wider in light
    • Greater demand for gas exchange while the plant in photosynthesising + respiring
    • Open/Close  controlled by guard cells surrounding them
      • Stomata close in dark
        • Photosynthesis can't happen in the dark- no need to let in CO2
      • When Closed- water can't escape
  • CGP- P.G 30

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