Some vascular bundles are described as open because these
Some vascular bundles are described as open because these
are surrounded by pericycle but to endodermis
are capable of producing secondary xylem and phloem
possess conjunctive tissue between xylem and phloem
are not surrounded by pericycle
Solution
In open vascular bundle, cambium is present between xylem and phloem of the same vascular bundle, $e g$, dicot stems. Due to the presence of cambium, secondary growth in stem occurs and secondary permanent tissues (secondary xylem, secondary phloem and vascular rays) are formed.