Some students are instructed to put a celery stalk in a red dye solution for a lab activity. first the students carefully cut the bottom of the stalk with a scalpel. then they put the stalk in the beaker with the solution and place the beaker on a shelf in the lab room. the next day they check the stalk and make observations. the students note that the leaves at the end of the stalk have changed color from green to red. the students cut across the celery stalk and use a hand lens to see that the small tube openings along the edge of the celery stalk are also red. the cross section is shown below. how do the plant systems work together to make this movement of liquid possible?