$A$ timber merchant told his customer that the wood log he was buying was from a $20$-year-old tree. How did he suggest this?

The cambial ring is generally

.......... permit the exchange of gases between the outer atmosphere and the internal tissue of the stem.

When an old tree grows,which part increases in thickness most rapidly?

Besides phellem and phellogen,the root periderm comprises of:

Identify the correct statements:
$A$. Lenticels are the lens-shaped openings permitting the exchange of gases.
$B$. Bark formed early in the season is called hard bark.
$C$. Bark is a technical term that refers to all tissues exterior to vascular cambium.
$D$. Bark refers to periderm and secondary phloem.
$E$. Phellogen is single-layered in thickness.
Choose the correct answer from the options given below: