The Processes of Water Flow in Xylem and Sugar Translocation

question 37

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

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Definitions:

Femur

The bone in the upper leg; commonly called the thigh bone.

Fibula

The lateral bone of the lower leg.

Ulna

The medial bone of the lower arm.

Ulna

A long bone in the forearm, running from the elbow to the smallest finger, and when in anatomical position, is located on the medial side of the forearm.