Stem cells in animals will help by regenerating the broken tissue and therefore useful in the treatment. Similarly, the plant stem cell will help the plant in the regeneration of an injured part. For example, if you peel the skin off the plant, after a while the peeled part is regenerated, and the plant heals. This is the effectiveness of the plant’s stem cell. Further, scientists argue that the regenerative role of the plant stem cells is not only in healing the injured part but also in the growth of a new plant. For example, if you trim branches of a tree today, the tree will regenerate another bud, and a branch grows again. A common argument that can be raised here is why is it believed that an apple a day will keep ageing away?