Cork is used as the stopper for bottles, for shock absorption and insulation because of
It is light and compressible
Non-reactive
Sufficiently resistant to fire
All of the above
Assertion : In woody stems, the amount of heart wood continues to increase year after year.
Reason : The cambial activity continues uninterrupted
The meristematic tissue responsible for the cutting of vascular tissue $(xylem \;and \;phloem)$ is called
During secondary growth of plants, stem phellogen cuts of cells on both sides. The outer cells gets differentiated into ...$A$... and the inner cells gets differentiated into ...$B$... cortex
Choose the correct combination of $A$ and $B$ with reference to above statement