Initiation of lateral roots and vascular cambium during secondary growth takes place in cells of:

The stem and roots of Cruciferae grow in thickness due to the activity of:

Give a scientific reason: Grafting is not possible in monocots.

Cork is used as a stopper for bottles,for shock absorption,and for insulation because of:

The tissue which participates in the secondary growth is

$I.$ 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.