Which tissue gives rise to secondary growth?

Secondary growth or increase in diameter is due to

Which of the following represents the correct sequence of layers from the center towards the periphery in a dicot stem?

The age of a tree can be estimated by counting the . . . . . . .

Trunks of some of the aged tree species appear to be composed of several fused trunks. Is it a physiological or anatomical abnormality? Explain in detail.

The youngest layer of secondary xylem in the wood of a dicot plant is located: