Allow carbon dioxide to diffuse into the leaf from the atmosphere.
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What structure so leaves have?
They are flat and thin with internal air spaces to increase the surface area for diffusion of gases.
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What increases the surface area of plant roots?
Root hair cells.
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What are stomata?
Tiny holes in the leaves of plants which allow gasses to diffuse in and out.
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What controls the size of the stomata?
The size of the stomata is controlled by guard cells which surround them.
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What gases diffuse in and out of leaves through the stomata?
Oxygen and carbon dioxide.
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Why is oxygen needed for plants?
It is needed for respiration and is a waste product of photosynthesis.
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Why is carbon dioxide needed for plants?
It is needed for photosynthesis and is a waste product of respiration.
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What does the movement of oxygen and carbon dioxide in plants depend upon?
It depends upon which process is taking place the most quickly.
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How do plants lose water?
Plants lose water vapour through the stomata due to evaporation in the leaves.
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Why are leaves flat and very thin?
So that the gases do not need to diffuse very far, there are also 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 the absorption of water and mineral ions.
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What happens when plants lose water faster than it is replaced by the roots?
The stomata can close to prevent wilting.
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What do plants needs to do for photosynthesis?
Let carbon dioxide diffuse into the leaves, at the same time the plant is losing water vapour through the stomata and could wilt if the roots are not absorbing water fast enough.
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**LOOK AT CROSS SECTION OF A LEAF***
***LOOK AT CROSS SECTION OF A LEAF****
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Other cards in this set
Card 2
Front
What structure so leaves have?
Back
They are flat and thin with internal air spaces to increase the surface area for diffusion of gases.
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