In dicot roots,cork cambium is derived from

Tyloses thickenings are seen in

When secondary growth in thickness is initiated in a dicot root,which of the following happens first?

Explain the structure and function of the cork cambium (phellogen).

Vascular cambium is a meristematic layer that cuts off

Select the correct statement$(s)$:
$(1)$ Lenticels are absent in woody climbers.
$(2)$ Lenticels are found in most woody trees.
$(3)$ Spring wood is lighter in color and has a lower density.
$(4)$ Sapwood is also known as duramen (heartwood).