The wall of cork cells is mostly impregnated with:

One cannot age a tree by its rings if that tree is located in which of the following forests?

Identify the meristems responsible for primary growth and secondary growth from the following list:
$I -$ Cork cambium,$II -$ Apical meristem,$III -$ Vascular cambium,$IV -$ Intercalary meristem,$V -$ Lateral meristem
Choose the correct option for primary growth and secondary growth respectively.

Which of the following meristems is responsible for extrastelar secondary growth in dicotyledonous stems?

The complementary cells of lenticels develop from the . . . . . . .

The secondary growth in the stem of $Cycas$ is brought about by: