Primary Root Tissues and Structure The organization of tissues in the primary root is simpler than in the primary stem because no leaves are produced on the roots and, consequently, there is no need to connect the vascular system laterally to offshoots. The primary body, produced by the three primary meristems, consists of a central cylinder of vascular tissue, the stele , surrounded by large storage parenchyma cells—the cortex —on the outside of which lies a protective layer of cells—the epidermis . Epidermis The root hairs of the young epidermal cells vastly increase the surface area through which movement of materials can occur. The thread-like hairs are simply enlargements of the protoplast that extend outward into the soil. They have little wall material and are extremely fragile and easily broken. The root epidermis of some plants is covered by a thin, waxy
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