An embryo develops from a fertilised egg. Cells at early stages in the development of the embryo are stem cells.
If stem cells are removed from the embryo – called embryonic stem cells – they will differentiate into any cell type.
Some stem cells remain in the bodies of adults – adult stem cells.
Adult stem cells are found in limited numbers at certain locations in the body, including the:
Cell division in plants occurs in regions called meristems.
The main meristems are close to the tip of the shoot, and the tip of the root.
In a growing shoot, new cells are being produced continuously near the tip. As the cells become older, further away from the tip, they become differentiated – they enlarge and develop vacuoles.