Root apical meristem is derived from the

According to the histogen theory,the stem epidermis is derived from:

Identify part $Y$ in the given diagram of a shoot apex.

$A$: Intercalary meristems are commonly located at the base of leaves,above the nodes,or below the nodes.
$R$: Vacuoles are large-sized in the cells of intercalary meristem.

The $DNA$ content of the quiescent zone is:

Meristem is defined as a plant tissue where