Narrow bands of parenchymatous tissue which pass through the secondary xylem and phloem radially are called

The stem and roots of Cruciferae grow in thickness due to the activity 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:

What is correct for heartwood?

Bottle cork is obtained from .........

In the stems of trees,the conduction of water takes place mainly through........