The roots of a plant take up water from the soil. You can see this with a regular carrot, which is the root of a carrot plant.
The roots bring water and nutrients up to the plant through hollow tubes as shown by the blue food coloring. Water and nutrients are essential for a plant to grow. Cut off another piece of carrot, looking for the same blue dots again. Keep cutting sections off the carrot. How far did the water travel up the carrot?