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

Choose the correct option from the following:
In $ \text{monocot} / \text{dicot} $ stem, the vascular bundles are arranged in a ring.

The lacunae in the vascular bundles of a monocot stem is:

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

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 :

In which of the following,the cortex,endodermis,pericycle,and pith are not clearly distinguishable?