The vascular bundles are conjoint, collateral, open with endarch protoxylem in:ADicot StemBMonocot StemCDicot LeafDMonocot LeafAnswer: A. Dicot Stem Read Explanation: Dicot stems have a well-defined epidermis with cuticle, a layer of dermis along with multicellular stem hair. The internal structure of a dicot stem mainly consists of epidermis, hypodermis, cortex endodermis, pericycle, vascular strand and pith. Read more in App