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4.2 Organisation - Coggle Diagram
4.2 Organisation
Guard cells & stomata
All over the leaf surface are small openings called stomata. The stomata can be opened when the plant needs to allow air into the leaves.
The size of the opening is controlled by the guard cells. This in turn controls the carbon dioxide going into the leaf and the oxygen and water vapour leaving it.
When the stomata are open, plants lose water vapour through them as well. The water vapour evaporates from the cells lining the air spaces and then passes out of the leaf through the stomata by diffusion.
Transportation in plants
Xylem and phloem vessels are similar in that they both transport materials around the plant. But they have many differences.
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Phloem
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Transports sugars, e.g. sucrose
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