Q.
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
| 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 |
Transport in Plants
Solution: