Worksheet Chapter 4: Transport in Plants

1. Explain the essential role of the Casparian strip in root endermal cells.

2. Differentiate between Transpiration and Guttation in plants.

3. A complete ring of bark including the phloem layer was removed from a woody tree stem (bark ringing/girdling experiment). Predict and explain the outcome observed in the stem regions above and below the ring after several weeks.

4. Fill in the blank: The attraction between water molecules and the hydrophilic lignified walls of xylem vessels is known as ________.

5. True or False: Sieve tube elements are dead cells at functional maturity with heavily lignified cell walls.

6. True or False: Translocation in phloem tissue occurs strictly in a single downward direction from leaves to roots.

7. Which process is responsible for liquid water exudation through hydathodes during conditions of low transpiration and high root pressure?

8. Outline the steps involved in hydrostatic pressure generation at the source region according to the Mass Flow Hypothesis.

9. State two structural adaptations of companion cells that support phloem transport.

10. Explain how Phytoremediation can be used to treat land polluted by industrial heavy metals, citing one suitable plant species.