The document describes an experiment where celery stalks are placed in colored water for 24 hours. After removal from the water, the celery stalks are sliced to reveal that the color has moved up from the bottom of the stalks where they were submerged. This demonstrates transpiration, the process by which plants transport water from their roots to their leaves. It is an essential process for distributing water throughout a plant, including to the tops of tall trees, and occurs through special tube-like cells called xylem. While celery is nutritious, the document notes that its smell and taste are disliked.