Which of the following is a difference between movement in the xylem and movement in the phloem?
A) movement in the phloem is by a pushing action; movement in the xylem is by a pulling action
B) movement in the phloem occurs through nucleated cells; movement in the xylem occurs through non-nucleated cells
C) movement in the phloem is always down; movement in the xylem is always up
D) movement in the phloem starts in the roots; movement in the xylem starts in the leaves
E) all of these are differences between movement in the xylem and movement in the phloem

Question

Quizplus · Accepted Answer

Movement in the xylem is by a pulling action, as it is driven by transpiration from the leaves, while movement in the phloem is by a pushing action, as it is driven by active transport from source to sink. The other choices are not true.

Which of the Following Is a Difference Between Movement in the Xylem