Found in front of the root apical meristem. A potato is an underground stem, modified for storage. A radish is a root, modified for storage. Structures that look the same to us may be made of different plant parts in different kinds of plants. For example, spines, thorns, and prickles are all sharp plant parts that protect the plant from herbivores.
Plant growth is fundamentally different from animal growth.
In other words, the overall shape of the adult animal is genetically determined from its earliest developmental stages. Once an animal has become an adult, it may become heavier or fatter, but it will not become larger. Thus the overall shape of the plant is not determined in advance, and the growth is said to be indeterminate. Meristems are regions of embryonic tissue capable of growing into new plant parts. Meristems are found in both roots and shoots.