HideShow resource information
  • Created by: Steff06
  • Created on: 01-05-16 14:12
View mindmap
  • Xerophytes
    • Unaviodable loss:
      • Loss of water by transpiration is unavoidable.
      • Stomata are open during the day and water will be lost when gases are exchanged.
    • Xerophyte is a plant that is adapted to reduce water loss so that it can survive in very dry conditions.
    • Adaptations of most plants:
      • Waxy cuticle - Reduces water loss due to evaporation through the epidermis.
      • Stomata on under surface - Reduces evaporation due to non direct heating from sun.
      • Stomata are closed at night when there is no light for photosynthesis.
      • Deciduous plants lose leaves in winter.
    • Adaptations of xerophytes:
      • Smaller leaves - Reduces SA so less water is lost by transpiration.
      • Densely packed spongy mesophyll - Reduces SA exposed to air, less water will evaporate.
        • Thicker waxy cuticle - Reduces evaporation.
        • Closing stomata when water availability is low - Reduces water loss.
      • Hairs on surface - Trap air which will become saturated with moisture and reduce diffusion of water vapour as potential gradient has been reduced.
        • Pits containing stomata at base - Trap saturated water vapour air, reduced gradient.
      • Rolling leaves - Lower epidermis not exposed to atmosphere can trap saturated air. Reduce gradient.
      • High salt conc in cells - low water potential. Less evaporation.


No comments have yet been made

Similar Biology resources:

See all Biology resources »See all Cellular processes and structure resources »