Xylem and phloem are components of the vascular bundle, which serves to enable transport of substances as well as for structural support
The xylem vessels are arranged in an X shape in the centre of the vascular bundle which enables the plant to withstand various mechanical forces like pulling.
The X shape arrangement of xylem vessels is surrounded by endodermis, which is an outer layer of cells whic hsuply xylem vessels with water.
AN inner layer of meristem cells is known as the pericycle