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Plants grow from areas of cells called meristem, which are the only places on the plant where new cells can be made.
On some kinds of plants, the meristem is arranged so that when the tip of a root - which contains the root apical meristem, from which new growth is initiated. If it is cut off, new roots are signaled to start growing from the side, an area called the lateral meristem. These kinds of plants don’t die if the tip is cut off - instead they grow new adventitious roots.
Roots of plants keeps on growing even after the evacuation of their tips it is on the grounds that the roots have meristematic cells which have the ability to grow. Meristematic cells are the totipotent cells which have the ability to form any kind of plant cell. These cells experience continuous division and create the new tip.
As auxin (plant growth hormone) is also available in tips of roots. When we cut it at that point no more extension will happen. Auxin here will induce now lateral growth of roots; just sidelong growth happens which will increment in flat development this procedure is utilized by gardeners.
