Closed vascular bundles lack (a) ground tissue (b) conjunctive tissue (c) cambium (d) pith.
Option C Vascular bundle consists of complex tissues, the phloem and xylem. In dicots, between xylem and phloem, cambium is present which helps in secondary growth. This type of vascular bundle is called open. While in monocots cambium is absent, so these are called closed vascular bundles.
