Epiblema in roots is derived from

The cells of the quiescent center are characterized by:

The procambium gives rise to ..............

Primary growth of a tree:

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 $Q$.

The primary growth in plants is effected by: