Transportation of Liquid and Food in Vascular Plants (page 2)
Try New Approaches
Will water rise in a celery stalk without any leaves? Remove all of the leaves from two celery stalks and use them to repeat the experiment. Use the knife to cut across both the top and bottom of each stalk. Make observations of the tops of the stalks.
Design Your Own Experiment
- How does humidity affect the rate of transpiration? Fill two small glass soda bottles half full with red-colored water. Stand one stalk of celery with leaves in each bottle. Use modeling clay as a seal around the mouth of each bottle. With masking tape and a marking pen, mark the water level of the liquid in each bottle. Use scissors to cut off the bottom of a clear, 2-liter plastic soda bottle. Secure the cap on this bottle and place it over one of the bottles containing a celery stalk (see Figure 10.2). Raise the plastic bottle and, using a spray bottle, mist the air inside the plastic bottle twice a day, morning and evening, for one week. Place the second bottle containing a celery stalk in a dry place. At the end of the week, compare the water level of the bottle in the misted environment to that of the bottle in the dry environment.
- Do plants transpire more at night or during the day? Select one leaf on each of two identical plants. Choose leaves that are of equal size. Place a clear plastic sandwich bag over each leaf and secure the bags to the stems with masking tape. Place both plants near a window that receives direct sunlight. Cover one of the plants with a cardboard box. After three hours, observe the inside of each bag.
Get the Facts
- Gluttation is the early morning release of liquid water at the edges of plant leaves. What causes this water release?
- Vascular plants have xylem and phloem tubes. What is the difference in the structure of these two sets of tubes? You could use diagrams to represent the difference in the cell structure of xylem and phloem tubes.
- Girding a tree means stripping away a continuous ring of bark. This procedure affects the phloem ring and thus interrupts the translocation of nutrients. How does girding affect the growth of the tree? What causes the bulge in the bark above the wound made by girding?
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