Question

On a warm summer day, the transpiration pull is the main force that drives from root parenchyma into the root xylem. The table shows values of $\left({\Psi }_p\right)$ (pressure potential) and $\left({\Psi }_s\right)$ (solute potential) in root xylem and root parenchyma, in $kPa$. In which of the options ($a$-$d$) would transpiration pull cause water to move from root parenchyma into the root xylem ?

Root parenchyma		Root xylem
${\psi }_p$	${\psi }_s$	${\psi }_s$	${\psi }_s$
200	-190	-200	5
-200	220	65	-5
200	-220	65	-5
200	-200	-65	-5

• A. a
• B. b
• C. c
• D. d

Answer 1

Answer: (D)

Correct answer is (d) d