The tissue made up of thin-walled rectangular cells responsible for the secondary growth is

“Sap wood” is otherwise called

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:

Which of the following are derived from the secondary meristems

$A$. Heart wood is durable, dark and central in position.
$B$. Tyloses are balloon like structures of xylem parenchyma in vessel lumen.
$C$. Late wood is formed during spring season.