In how many planes does the tunica divide?

What is the characteristic of the cells in the quiescent center?

The outermost primary meristem gives rise to

The histogens are classified on the basis of:

Identify the tissues $P$ and $Q$ based on their functions:
Tissue $P$: Responsible for the increase in length of roots and stems.
Tissue $Q$: Responsible for the increase in girth (thickness) of roots and stems.
Choose the correct option for $P$ and $Q$.

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