Cells within multicellular organisms are specialised for particular functions.
Cells that are specialised are able to perform their functions much more effectively than undifferentiated cells.
The principle is the same as society. A group of people can get more done when each specialises on certain functions.
It would be a waste of resources if all cells in a plant, even root cells and cells inside the stem not exposed to light, developed the structures needed for photosynthesis.
Below are three examples of specialised cells:
| Root hair cell ||Absorbing water from the soil|| |
| Xylem vessel ||Transporting water around the plant|| |
| Red blood cell ||Transporting oxygen in the blood|| |