$A$ mature woody stem has a peripheral waterproof tissue with openings in the form of scars on its surface. These are:

The increase in girth of a dicot stem is due to the activity of:

The wood is,in fact,a

Age of a tree can be estimated by

The collective name for cork cambium and phelloderm is

Read the components $a$ to $d$ given in the note and identify the correct sequence of components from the outside to the inside of a mature stem:
$(a)$ Secondary cortex
$(b)$ Wood (Secondary xylem)
$(c)$ Secondary phloem
$(d)$ Phellem (Cork)