Which one of the following is a type of tissue system?

The primary function of lenticels is $..........$.

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.

All the tissues on the inner side of the endodermis together constitute the

The waxy substance secreted by epidermal cells on their outer walls is:

What is observed during the formation of vascular bundles in plants?