Preparation
Observe growing plants and trees. Talk about where they get their water from and how it gets to the leaves at the top of a tree.
Equipment
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Clear containers
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Water
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Food colouring
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Kitchen paper
Background information
Plants and trees use capillary action (along with other forces) to pull water up from their roots to the ends of their leaves. Water molecules move through narrow tubes called capillaries (or xylem).