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

Increase in the girth of a plant is known as:

Which of the following consists of dead cells?

The outer part of the periderm is . . . . . . .

In the primary tissues of the stem,the cambium separating xylem and phloem is called

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: