• Student test on flower colours

• Teacher notes and answers for this test

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Parent and Teacher Notes

This experiment explains the movement of water through plants to your child by letting them create their own rainbow flower. Plants need water to live and grow, and they absorb water through their roots. Special tubes called xylem help transport the water from the roots to the stem, and up to the leaves and petals of the flower. The flower absorbs the coloured water and moves it all the way up to its petals.

Scientific concepts covered:

Movement of water in plants: The pressure in the roots of a plant causes water to enter the xylem. Water molecules stick to each other – this is known as cohesion. They also stick to other surfaces, like the walls of the xylem. The water molecules travel together in a group, pushed upwards by the pressure, all the way up the flower. This is why we can see the coloured water in the petals of our flower.

Xylem: Special tubes in plants that help carry the water through the whole plant, from the roots up to the stem, leaves, and petals.

Cohesion: Molecules of the same kind are attracted to each other – this is known as cohesion. Cohesion allows the water molecules to stick to each other. Water molecules have especially strong cohesion, because they can form hydrogen bonds with each other.

Production Notes

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