GAS EXCHANGE

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  • GAS EXCHANGE
    • Plants
      • leaves
        • Thin, flat provide large surface area
      • Night-photosynthesis. Day -respiration
      • Cells
        • Palisade- contain chloroplasts for photosynthesis
        • Spongy mesophyll- gas excahnge
    • Insects
      • Spiracles- holes for gas exchange & closed to prevent water loss
      • Short difffusion gradient
      • Small SA:Vol ratio
  • Xerophytes
    • Plants
      • leaves
        • Thin, flat provide large surface area
      • Night-photosynthesis. Day -respiration
      • Cells
        • Palisade- contain chloroplasts for photosynthesis
        • Spongy mesophyll- gas excahnge
    • Thick waxy layer:  stops evaporation through leaf cells
    • Sunken Stomata: maintains humidity, diffusion gradient reduced
  • Sunken Stomata: maintains humidity, diffusion gradient reduced
  • Rolled leaves: maintain humidy, reduced diffusion gradient
    • Xerophytes
      • Thick waxy layer:  stops evaporation through leaf cells
  • Hairy leaves: trap layer of water
    • Tracheal tubes- pipes which oxygen moves through
      • Spiracles- holes for gas exchange & closed to prevent water loss
    • Tracheoles- brings air to respiring tissues
      • Tracheal tubes- pipes which oxygen moves through
      • Large SA:Vol ratio

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