B3 1.8: Exchange in plants.

All information was taken directly from the AQA revision guide with only the key points from B3 1.8.

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  • Created by: JSpencer
  • Created on: 03-03-16 21:13
What diffuses in and out of leaves?
Gases.
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Where do they diffuse through?
Tiny holes called stomata.
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What do the guard cells control?
The size of the Stomata.
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What gases go into a plant?
Oxygen and Carbon Dioxide.
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What is oxygen used for?
For respiration and is a waste product of photosynthesis.
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What is Carbon dioxide used for?
Needed for photosynthesis and is a waste product of repiration.
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What does the movement of these gases depend on?
Which process is taking place the most quickly.
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How else do plants lose water vapour? From where?
From evaporation through the stomata.
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Why do the gases not need to diffuse very far?
As the leaves are flat and thin with internal air spaces.
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What is taken up by the roots?
Water and mineral ions.
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What do root hair cells do?
Increase the surface area of roots for absorption of water and mineral ions.
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Why would the stomata close? To prevent?
If the plant was losing water faster then it was replacing it to stop it wilting.
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Other cards in this set

Card 2

Front

Where do they diffuse through?

Back

Tiny holes called stomata.

Card 3

Front

What do the guard cells control?

Back

Preview of the front of card 3

Card 4

Front

What gases go into a plant?

Back

Preview of the front of card 4

Card 5

Front

What is oxygen used for?

Back

Preview of the front of card 5
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