Xerophytes

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  • Created by: Steff06
  • Created on: 01-05-16 15:00
What is a xerophyte?
A plant that is adapted to reduce water loss so that it can survive in very dry conditions.
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Why is the loss of water by transpiration unavoidable?
Stomata are open during the day for gaseous exchange and photosynthesis. Water will lost through these stomata.
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What adaptations do most plants have to reduce water loss?
Waxy cuticle, stomata on under surface, stomata closed at night, deciduous plants lose leaves in winter.
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How does a waxy cuticle reduce water loss?
Waxy cuticle on the leaf to reduce water loss due to evaporation through epidermis.
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How do stomata on the under surface reduce water loss?
Not directly heated from sun - reduces evaporation and water loss.
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How does stomata being closed at night affect water loss?
No light available for photosynthesis so close to reduce water loss.
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How do deciduous plants reduce water loss?
Lose leaves in winter so no water lost from leaves.
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What are adaptations of xerophytes?
Smaller leaves, stomata close when water availability is low, thicker waxy cuticle, spongy mesophyll, pits, hairs, high salt con, rolling leaves.
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How do smaller leaves reduce water loss?
Reduce SA, so less water is lost by transpiration.
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What does a thicker waxy cuticle do?
Reduces evaporation.
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What is the effect of stomata closing when availability of water is low?
Reduces water loss though stomata.
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What does densely packed spongy mesophyll do?
Reduces SA exposed to air, less water will evaporate.
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What is the effect of having pits at the base of stomata?
Trap air saturated with water vapour, reduces potential gradient.
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What do the hairs on the surface do?
Trap air which will become saturated with moisture and reduce diffusion of water vapour as potential gradient is reduced.
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How does rolling leaves reduce loss of water vapour?
Lower epidermis not exposed to atmosphere and will trap saturated air, reducing gradient.
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What does a high conc of salt in cells mean?
Lowers water potential. Less evaporation.
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Where is Marram grass adapted to live?
On sand dunes.
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What adaptations does Marram grass have?
Leaf rolled up, thick waxy cuticle, trapped air, hairs on surface, stomata in pits.
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Other cards in this set

Card 2

Front

Why is the loss of water by transpiration unavoidable?

Back

Stomata are open during the day for gaseous exchange and photosynthesis. Water will lost through these stomata.

Card 3

Front

What adaptations do most plants have to reduce water loss?

Back

Preview of the front of card 3

Card 4

Front

How does a waxy cuticle reduce water loss?

Back

Preview of the front of card 4

Card 5

Front

How do stomata on the under surface reduce water loss?

Back

Preview of the front of card 5
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