Cork tissue arises from

Medullary vascular bundles are present in

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:

Extrastelar secondary growth is caused by the activity of:

Lenticels are formed in the bark,which are:

In dicot stem,secondary growth is due to the activity of: