Which of the statements given below is not true about the formation of Annual Rings in trees?

The stem and roots of Cruciferae grow in thickness due to the activity of:

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:

Complementary cells are associated with

In cambium,the amount of secondary xylem produced is more than secondary phloem because..........

In dicot roots,cork cambium is derived from