Monocot root differs from dicot root in having

Describe the internal structure of a sunflower root.

In dicot roots,cells of which region show Casparian strips?

What is the important characteristic of an endodermal cell?

In the diagram of $T.S.$ of the stele of a dicot root,the different parts have been indicated by alphabets; choose the answer in which these alphabets correctly match with the parts they indicate.

Define the following terms:
$(i)$ Endarch xylem
$(ii)$ Exarch xylem