In old dicot stems, a major part of the wood is filled up with tannins, resins, gums etc. This part of wood is called

Intrafascicular cambium is present in between the

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:

A transverse section of the trunk of a tree shows concentric rings which are known as growth rings. How are these rings formed ? What is the significance of these rings ?

Describe contribution of cork cambium in secondary growth.

The tissue which participates in the secondary growth is