Which tissue is derived from the plerome?

The stelar region (vascular tissue,pericycle,and pith) is formed from which of the following?

Dermatogen,periblem and plerome are

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.

Promeristem is found in

Which of the following is an example of a primary meristematic tissue?