What we need now is two leafy plants of the same kind. It would be best if they were also the same age. Let's take them both out of their pots and have a look at their roots. We may even make a drawing of the roots, put the name of the plants on the drawing, and keep it for reference, in case we want to compare roots of several different plants later on in our studies.

We'll cut the roots off of one of these plants, and leave the other as it is. They both will be replanted into fresh pots, in fresh potting soil. A note on the calendar will remind us, later, of the date we replanted them. Checking on their growth each day might show us just how important roots are to the plant.