Biology B3 1.9 Transpiration.

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How is water lost from plants?
From the leaves by evaporation.
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How does the water escape the leaf?
Through vapour via the stomata when they open to allow carbon dioxide to enter the leaf.
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What purpose can wilting serve?
Wilting can protect the leaf from excessive water loss.
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What will conditions which increase the rate of evaporation increase?
The rate of transpiration.
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How do plants take up water?
Through the roots.
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What happens when water is taken up through the roots?
The water passes through the plant to the leaves.
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What happens to the water in the leaves?
The water evaporates from the leaf cells and the water vapour diffuses out through the stomata.
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What is the movement of the water through a plant called?
The transpiration stream.
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What could happen if the rate of evaporation in the leaves is greater than the water uptake by the roots?
The plant could dehydrate?
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When is evaporation more rapid?
In hot, dry, windy or bright conditions.
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What can prevent excessive water loss?
The guard cells can close to prevent excessive water loss, wilting can also reduce water loss.
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How can wilting reduce water loss?
The leaves hang down, which reduces the surface area.
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What can be used to show how the uptake of water by a plant changes with different condition?
A potometer, this gives a goo idea of the amount of water lost by transpiration.
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Other cards in this set

Card 2

Front

How does the water escape the leaf?

Back

Through vapour via the stomata when they open to allow carbon dioxide to enter the leaf.

Card 3

Front

What purpose can wilting serve?

Back

Preview of the front of card 3

Card 4

Front

What will conditions which increase the rate of evaporation increase?

Back

Preview of the front of card 4

Card 5

Front

How do plants take up water?

Back

Preview of the front of card 5
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