Xerophytes

  • Created by: Hindleyc
  • Created on: 03-06-18 11:47
What are xerophytes?
Plants adapted to conditions where water loss Is greater than its availability
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Where are they found?
Arctic desert and sea shore
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What are the 3 general forms of adaptation designed to conserve water?
Reduction in transpiration rate, storage of water- succulents, uptake more water
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How do they reduce transpiration rate?
Most have few stomata, thick cuticle acting as waxy barrier to prevent water loss
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What do hinges cells enable?
Leaves to curl into a tube- water cannot diffuse through stomata as it is confined to inner surface
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What does a hairy epidermis do?
Traps moist air in hair layer which decreases diffusion path
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What do sunken stomata do?
Traps most air above stomata decreasing diffusion path
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What do cacti have?
A reduced SA of leaves small and circular reducing transpiration and helps give rigidity when wilting
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What is Photosynthesis carried out by. then?
Stem or petiole
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How do they store water?
Succulent leaves and stems that store water
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So why do they have spines for leaves?
to deter desert animals as this can be attractive for them
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How do they uptake water?
2 sets of roots- sideways to collect surface water from occasional showers and deep penetrating roots to obtain water from a deep water table
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Other cards in this set

Card 2

Front

Where are they found?

Back

Arctic desert and sea shore

Card 3

Front

What are the 3 general forms of adaptation designed to conserve water?

Back

Preview of the front of card 3

Card 4

Front

How do they reduce transpiration rate?

Back

Preview of the front of card 4

Card 5

Front

What do hinges cells enable?

Back

Preview of the front of card 5
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