In which type of vascular bundles are xylem and phloem present at the same radius?

Select the correct statements.
$I.$ Epidermal cells have a small amount of cytoplasm and a large vacuole.
$II.$ $A$ waxy layer,the cuticle,is absent in roots.
$III.$ Root hairs are unicellular,while stem hairs/trichomes are multicellular.
$IV.$ Trichomes are branched/unbranched,soft/stiff,and secretory or transpiration-preventive.
$V.$ Guard cells are dumb-bell-shaped in monocots (e.g.,grass) and bean-shaped in dicots.

Closed vascular bundles lack

What are the specialized epidermal cells surrounding the guard cells called?

The ground tissue system includes ................ .

Distinguish between the following: Open and closed vascular bundles.