Seasonal activity of vascular cambium is influenced by many factors,except

Jute fibres are obtained from the

$I.$ 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.

When secondary growth is initiated in a dicot stem,what will happen first?

Coastal trees do not show annual rings because:

Open vascular bundles lack .......... .