Leave the third circle alone as a control. These compounds have different colors depending upon the strength of an acidic or basic solution. Because of their ability to change colors, anthocyanins are one kind of indicator for determining the strength of an acid or base. They are also present in the petals of red roses. Totally Tubular Plants Kids, as you know, plants need water to live.
Water goes from the root, up the stem, and into the leaves.
This experiment will help you find out. Notice the small dots on the narrow end of the celery stalk. Add 5 drops of the food coloring to the water and place the wide end of the celery in the water. After a few hours you should see that the little dots on the top of the celery are now blue. Use a fingernail to start pulling away one of the blue tubes at the top.