Xylem and phloem：練習題

The diagram shows a transverse section through a dicotyledonous stem. Tissue X is located on the inner side of the vascular bundle, and tissue Y is located on the outer side.
Which row correctly identifies a substance transported by tissue Y and describes the structural adaptations of tissue X according to the syllabus?

Name the substance found in the cell walls of xylem vessels that provides structural support to the plant.

Describe two structural adaptations of xylem vessels that allow them to transport water efficiently.

Explain how xylem vessels are adapted to form a long, continuous tube for the transport of water.

(a) State the functions of xylem and phloem in a dicotyledonous plant.
(b) Describe the position of the xylem and phloem in the stem of a non-woody dicotyledonous plant.

Xylem vessels are highly specialised for the transport of water.
(a) Relate the structure of xylem vessels to their function by describing three specific structural adaptations.
(b) Explain how and why wilting occurs in a plant when the rate of transpiration exceeds the rate of water uptake.