Here is a simple experiment for younger kids that allows them to see how water is absorbed and circulated through a plant. This works best with celery, queen anne's lace or a white carnation.
Simply fill a glass with water and mix in 8 to 10 drops of red food coloring. Place a stalk of freshly cut celery or a flower stem into the glass, with the leaves at the top out of the water. It is important that the plant has leaves since its circulation is powered by 'transpirational pull' or the breathing of the leaves.
After several hours you will begin to notice red marks on the leaves as the water is absorbed by the plant. Cut the celery to look inside. The 'strings' will be red and little red dots will appear on the base. Leave overnight to see the complete circulation of the food coloring.
Best of all, you can eat your experiment for lunch.
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