As you complete the experiment, record your data. If using the video, you may want to stop it when the experiment displays the 15 minute mark, the 30 minute mark, and when the cross-section is shown under the microscope. Submit your data and answers to the following questions: After the first 15 minutes, describe what is happening to the leaves on the celery stalk.
Compare the color of the leaves from 15 minutes to 30 minutes. Give a reason why the leaves look different.
Looking at the cross-section, describe what you see. Can you identify the transport bundles of xylem and phloem? What color are they?
How does this lab prove vascular tissues carry water and minerals up the stem?
Predict what would happen if you repeated this experiment, but instead of using red food coloring, you use blue.

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Vascular tissue of plants which consists of xylem and phloem. Xylem transport water and minerals from the root to the upper parts of the plant. Phloem transports food and nutrients from the leaves to the lower parts of the plants.  

In the experiment, since the xylem was kept intact, the transport of the water from the root to the upper parts of the plant was also intact. However, since it was in the sun, the plant was able to perform photosynthesis. Photosynthesis is a process during which plants produce food (carbohydrates) in the green leaves. That food should be transported through the phloem to the lower parts of the plant. But, the phloem was removed, so the food remained and accumulated in the upper parts of the plant. All of these is the reason why the leaves appeared turgid and the upper part of the stem above the cut in the phloem appeared swollen.