Which of the Following Statements Is False Concerning the Xylem

question 52

Multiple Choice

Which of the following statements is false concerning the xylem?

• A) Xylem tracheids and vessels fulfill their vital function only after their death.
• B) The cell walls of the tracheids are greatly strengthened with cellulose fibrils forming thickened rings or spirals.
• C) Water molecules are transpired from the cells of the leaves, and replaced by water molecules in the xylem pulled up from the roots due to the cohesion of water molecules.
• D) Movement of materials is by mass flow; solutes in xylary sap move due to a positive turgor pressure gradient from source to sink.
• E) In the morning, sap in the xylem begins to move first in the twigs of the upper portion of the tree, and later in the lower trunk.

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