Who proposed the Quiescent Center theory?

Intercalary meristem results in

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 $Q$.

Intercalary meristem results in

Select the odd one out from the following.

In apical and lateral meristems,$..........$ type of cell division is observed.