Annual rings are bands of .........

As secondary growth proceeds in a tree,the thickness of which of the following increases?

How many types of cells are present in the vascular cambium?

Increase in the girth of a plant is known as:

Read the different components from $(i)$ to $(iv)$ in the list given below and tell the correct order of the components with reference to their arrangement from outer side to inner side in a woody dicot stem.
$(i)$ Secondary cortex $(ii)$ Wood $(iii)$ Secondary phloem $(iv)$ Phellem
The correct order is:

The girth of the stem of a date palm increases due to the activity of: