The study of wood is called ...........

The cork is impervious to water due to

Identify $X$ and $Y$ in the given figure.

Ring bark is present in

Dendrochronology is the study of

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: