After two or three years of the secondary growth, what happens to the cortex in a dicot root?

Vascular cambium of the root is an example of

Select the wrong statements.
$I.$ Primary and secondary phloem gets crushed during secondary growth.
$II.$ During secondary growth,primary xylem remains more or less intact.

Identify the incorrect statement regarding heartwood.

Given below are two statements: One is labelled as Assertion $A$ and the other is labelled as Reason $R$:
Assertion $A$: Late wood has fewer xylary elements with narrow vessels.
Reason $R$: Cambium is less active in winters.
In the light of the above statements,choose the correct answer from the options given below:

Secondary growth is absent in