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:

Sex Chromosomes

Chromosomes that determine an individual's sex, with females typically having two X chromosomes and males having one X and one Y chromosome.

Indolamine

A type of neurotransmitter which includes serotonin, involved in the regulation of mood and behavior.

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Deoxyribonucleic acid, a molecule that carries the genetic instructions used in the growth, development, functioning, and reproduction of all known living organisms and many viruses.

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