If one debarks a tree,what parts of the plant are being removed?

Medullary vascular bundles are present in

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:

In an annual ring,the light coloured part is known as

The functional xylem of a dicot tree is:

Describe the contribution of cork cambium in secondary growth.