What is the common function of the cortex in plants?

In which plant are the vascular bundles scattered in the ground tissue,and each vascular bundle is surrounded by a sclerenchymatous bundle sheath?

Describe the epidermis of a maize stem.

Identify $P, Q,$ and $R$ in the given internal structure.

Starch sheath and bundle cap are found in the internal structure of:

Select the correct option$(s)$ from the following statements:
$(i)$ Fibers are thin-walled,elongated,and pointed cells.
$(ii)$ Water-containing cavities (lysigenous cavities) are found in the vascular bundles of monocot stems.