Normal secondary growth occurs in

The characteristic feature of porous wood is represented by the presence of .........

Which of the following consists of dead cells?

The cork cambium (phellogen) is formed from:

The anatomy of springwood shows some peculiar features. Identify the correct set of statements about springwood.
$(a)$ It is also called as the earlywood
$(b)$ In spring season cambium produces xylem elements with narrow vessels
$(c)$ It is lighter in colour
$(d)$ The springwood along with autumnwood shows alternate concentric rings forming annual rings
$(e)$ It has lower density
Choose the correct answer from the options given below:

Secondary growth occurs in .........?