What is correct for heartwood?

Vascular cambium of dicot root is purely secondary in origin and arises from:

In which of the following is there no differentiation of bark,sapwood,and heartwood?

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).

The process by which plants become woody is:

The periderm includes: