Identify $P, Q,$ and $R$ in the given anatomical structure.

The cross-section of a plant material showed the following features when viewed under the microscope.
$(A)$ The vascular bundles were radially arranged.
$(B)$ Four xylem strands with exarch condition of protoxylem.
To which organ should it be assigned?

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:

The given figure shows a section of a root apex. Select the correct option for $P$ and $Q$.

	$P$	$Q$
$A$	Epiblema	Cortex
$B$	Cortex	Epiblema
$C$	Stele	Cortex
$D$	Cortex	Stele

The cortex is found between which of the following?

The Casparian strips of the root endodermis contain a mixture of: