Centripetal and centrifugal xylem are the important features of

Well-developed pith and exarch vascular bundles are characteristics of which of the following?

$(i)$ Unicellular hair
$(ii)$ Endodermis with passage cells
$(iii)$ Pith$-$small$/$inconspicuous
$(iv)$ Radial vascular bundle
$(v)$ Xylem exarch
$(vi)$ $2-4$ xylem and phloem
The above description refers to which of the following?

How many histogens are present at the apex of the root?

Given below are two statements:
Statement $I:$ Endarch and exarch are the terms often used for describing the position of secondary xylem in the plant body.
Statement $II:$ Exarch condition is the most common feature of the root system.
In the light of the above statements,choose the correct answer from the options given below:

Considering the root apex of monocotyledons,there are three groups of initials. Which of the following correctly describes their derivatives?