Answer :
The vascular bundle in the shape of a single central cylinder in a root is called the stele.
Vascular Bundle :
In vascular plants, a vascular bundle is a component of the transport system. The transport takes place in the stem, which comes in two varieties: xylem and phloem. Both of these tissues are found in a vascular bundle, which also contains supporting and protective tissues.
Stele in plants :
The primary vascular system of the plant axis (stem) and its associated ground tissues comprise the plant stele (e.g., pith). The stele is made up entirely of primary tissues that have been differentiated from procambial strands derived from the apical meristem.
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