What is the function of the hypodermis?

What is the main characteristic of the vascular bundles in a monocot stem?

Identify $A, B, C$ and $D$ in the given figure of a monocot stem cross-section.

In the stem of maize $(Zea \ mays)$,the vascular bundles are ........... .

Pericycle and endodermis are not found in

Complete the following analogy-type questions:
$(i)$ Root : Root hair :: Stem : ...........
$(ii)$ Dicot stem : Open vascular bundle :: Monocot stem : ...........