Which tissue is responsible for continuous growth in plants?

The word "protoderm" was coined by

According to the Histogen theory,the plerome gives rise to:

The cells in this region are rich in protoplasm and possess large,conspicuous nuclei.

The tissue which perpetuates itself by active cell division 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.