Which of the following is not a part of the periderm?

$A$ 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?

Growth rings $(annual\ rings)$ are formed by the activity of:

Tissue present in an annual ring is

Which tissue is more active during the autumn season?

The periderm consists of ............ .