Root apical meristem is derived from the

The quiescent centre in root meristem serves as a

The $DNA$ content of the quiescent zone is:

Which of the following are characteristics of cells in the meristematic region?
$I-$ Cells divide continuously.
$II-$ Cells are rich in protoplasm.
$III-$ Cells possess a large,conspicuous nucleus.
$IV-$ All cells of meristematic tissue are differentiated.
$V-$ Cell walls are primary,thin,and cellulosic with abundant plasmodesmata.

Tunica is a rib meristem because it divides in

Who proposed the Quiescent Center theory?