What type of vascular bundles are found in monocot stems?

What is the common function of the cortex in plants?

The centrifugal arrangement of the xylem is called

In $Barley$ stem,vascular bundles are:

Which of the following is absent in the primary and secondary structure of the stem of $Pinus$?

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.