How can the apical meristematic tissue of the root and shoot be studied?

(N/A) The apical meristematic tissue of the root and shoot can be studied by observing the growth patterns of onion roots.
$1$. Take two glass jars and fill them with water.
$2$. Place an onion bulb on each jar.
$3$. Observe the growth of roots in both bulbs for a few days.
$4$. Cut the root tips of one of the onions after a few days and observe the further growth.
$5$. It will be observed that the root whose tip was cut stops growing,demonstrating that the apical meristem is responsible for primary growth at the tips.