Plant Adaptations

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Plant Adaptations
2012-03-08 12:11:40
Plant Adaptations Biology

Higher Biology - Unit Two - Plant Adaptations
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  1. What are plants which live in habitats where water is abundant and excessive transpiration does not occur called?
  2. What are the plants which live in deserts and windy habitats called?
  3. What are the plants which live completely or partially submerged in water called?
  4. Describe four Xerophyte adaptations that reduce transpiration
    • Thick epidermis/cuticle - reduced evaporation
    • Few stomata/few leaves/ needle like leaves - reduced surface area for evaporation
    • Rolled leaves or hair leaves with sunken stomata - trap layer of moist air to reduce evaporation
    • Reversed stomatal rhythm - reduced evaporation in hot climates as stomata are closed during the hottest part of the day
  5. Describe two Xerophyte adaptations that reduce water loss
    • Wide shallow roots and long tap roots - Reach and absorb maximum water volume
    • Succulent tissue (leaves or stem) - Stores water
  6. Describe the adaptations of Hydrophytes and what they do for the plant
    • Submerged leaves finely divided or narrow in shape - Prevents water damage
    • Long leaf stalks and floating leaves - Help plant adjust to changing water levels preventing stomata flooding
    • Air spaces in leaves/stems - Stores oxygen and aids buoyancy
    • Xylem reduced - Water supports and is readily available so not much xylem needed
    • Stomata on upper surface of floating leaves - allows gas exchange with air
    • Xylem in centre of stem - Gives maximum flexiblity in response to water currents