Protosteles are found in

For a critical studyof secondary growth in plants, which one of the following pairs is suitable ?

According to histogen theory, stem epidermis is derived from

In which of the following, there is no differentiation of bark, sapwood and heartwood?

Casparian strip is found in

Select the correct statements

$I.$ Epidermal call have small amount of cytoplasm and a large vacuole

$II.$ Waxy layer 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 dicots and bean-shaped in monocots (e.g., grass)