Explain the horizontal cut experiment to demonstrate root pressure.

(N/A) $\Rightarrow$ To demonstrate the existence of root pressure,select a small,soft-stemmed plant.
$\Rightarrow$ On a day with high atmospheric humidity,cut the stem horizontally near the base using a sharp blade,early in the morning.
$\Rightarrow$ You will observe drops of xylem sap oozing out from the cut surface; this phenomenon occurs due to the positive root pressure generated by the roots.
$\Rightarrow$ If you attach a rubber tube to the cut stem as a sleeve,you can collect the exudate,measure the rate of exudation,and analyze the chemical composition of the sap.