The Processes of Water Flow in Xylem and Sugar Translocation

question 13

Multiple Choice

The processes of water flow in xylem and sugar translocation in phloem differ in many respects.Which of the following is not a difference between xylem and phloem transport?

• A)Water potential gradients are required for xylem transport to occur,but not for phloem transport.
• B)Xylem transport is a wholly passive process;phloem transport includes active (energy-requiring)processes.
• C)Cells through which xylem transport occurs are "dead" at maturity;those in phloem transport are "alive."
• D)Xylem transport always occurs in the same direction;phloem transport does not.

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