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

The pores present in the wall of a plant's stem are called...

The study of wood is called ...........

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).

In any dicot root having secondary growth,the cork is the