On the basis of origin,meristematic tissues can be classified into how many groups?

In flowering plants,the vascular tissue develops from:

Tunica is a rib meristem because it divides in

In a woody dicot plant,which of the following parts contain primary tissues?

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.

What are the structural characteristics of $(a)$ Meristematic cells near the root tip and $(b)$ The cells in the elongation zone of the root?