The cork cambium,cork,and secondary cortex are collectively called:

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).

Secondary growth is absent in

In old trees,the greater part of secondary xylem is dark brown due to the

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

Which useful product is derived from the epidermis (cork cambium/phellogen activity)?