The cell wall is impermeable to water and deposition of suberin is also found in

Heartwood differs from sapwood in

Vascular cambium is a meristematic layer that cuts off

Which of the following is true for the dicot roots?

The activity of cambium in plants is under the control of

$A$ : Bark is all the tissue outside steler cambium.

$R$ : Bark is formed due to the activity of phellogen only.