This wood is light in color,has low density,and consists of a large number of xylem elements with wide vessels.

$I.$ Annual rings are formed as a result of seasonal environmental conditions.
$II.$ Tracheids/vessel elements are larger during periods when water is abundant.
$III.$ Tracheids/vessel elements have thicker walls during periods of water deprivation.
$IV.$ Wood formed in previous years is always darker than newer wood.
Select the combination of correct statements from the options given below.

In dicot roots,what is the very first event that occurs during the initiation of secondary growth?

Complementary cells are associated with

The best method to determine the age of a tree is:

Growth rings are generally well marked in trees growing in