Question

How open vascular bundles differ from closed vascular bundles?

Answer 1

Open vascular bundles	Closed vascular bundles
It contains cambium in between phloem and xylem.	Intra-fascicular cambium is absent.
Phloem and xylem are not in direct contact with each other.	Phloem and xylem are in direct contact with each other.
These are found in dicot and gymnosperm stems.	These are found in leaves and monocot stems.
These can be collateral and bi-collateral.	These can be collateral or concentric.