aqa a-level biology: xerophytic plants

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7 Terms

1
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What are xerophytes?

Plants that are adapted to living in areas where water is in short supply.

2
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State five typical adaptations of a xerophytic plant.

1. Thick cuticle

2. Sunken stomata (inside leaf)

3. Have hairs (trichromes)

4. Rolled leaves

5. Thick epidermis.

3
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What are the advantages of having a waxy cuticle?

- Waxy; waterproof.

- Reduces cuticular transpiration on upper surface.

4
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What are the advantages of having sunken stomata?

Traps layer of moist air, reducing water potential gradient and reducing transpiration and evaporation.

5
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What are the advantages of having hairs?

Traps layer of moist air, reducing water potential gradient and reducing transpiration and evaporation.

6
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What are the advantages of having rolled leaves?

- Traps layer of air which becomes SATURATED.

- Reduced water potential gradient and SA over which water can be lost.

7
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What are the advantages of having a thick epidermis?

Decreases water loss by evaporation.