In which group of plants are bordered pits found in the xylem vessels?

You are given two pieces of old dicot stem and root. Which of the following anatomical features will be useful to distinguish between them?

Describe the characteristics of the maize stem epidermis.

The ring arrangement of vascular bundles is the characteristic feature of

The transverse section of a plant material shows the following anatomical features under microscope $:-$
$(a)$ Collenchymatous hypodermis
$(b)$ Sclerenchymatous pericycle located just above phloem bundles in semi-lunar patches.
$(c)$ Vascular bundles are arranged in a ring.
$(d)$ Vascular bundles are conjoint & open.
Plant material should be :

$A$ hard hypodermis is found in . . . . . . .