Gas Exchange/Water loss in plants

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  • Gas Exchange in Plants
    • DicotyledonosPlants
      • 1) Plants need CO2 for photosynthesis, produces O2 as waste gas. Need O2 for respiration which produces CO2 as waste gas
      • Exchange gases at surface of mesophyll cells. Large SA
      • 3) Gases move in and out through stomata in epidermis
      • 4) Stomata can open to allow exchange of gases, close if plant loses too much water. Guard cells control opening/closing of stomata
    • Water loss in insects
      • Close spiracles using muscles
      • Have waterproof, waxy cuticle- reduces evaporation
      • Tiny hairs around spiracles, reduces evaporation
    • Water loss in plants
      • Stomata usually kept open during the day to allow gaseous exchange
      • Water enters guard cells, making them turgid, opens stomatal pore
      • If plant becomes dehydrated, guard cells lose water, become flaccid, closes pore
    • Xerophytes
      • Warm, dry, windy habitats
      • Stomata sunk in pits that trap moist air, reduces evaporation
      • Layer of hairs around epidermis to trap layer of moist air
      • Curled leaves with stomata inside, protects them from wind/diffusion
      • Reduced number of stomata, less places for water to escape
      • Waxy, waterproof cuticles to reduce evaporation


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