. Explain the term with examples from various plant tissues
i. Differentiation – It is permanent in structure, size, function, and composition of cells, tissues or organs. For instance, meristematic tissues give rise to new cells that mature and get differentiated into special tissue or plant organ. For example – formation of treachery element results in the loss of cell protoplasm. To carry water at a stretch under extreme tension, they develop an elastic, strong, lignocellulosic secondary cell wall.
ii. De-differentiation – Under certain conditions, the cells that have dropped the capability to divide can regain the capacity, this process is referred to as de-differentiation. For example – the development of meristems – the cork cambium from completely transformed parenchyma cells.
iii. Re-differentiation – During de-differentiation, before-mentioned tissues/meristems after division generate cells that lose the ability to divide once more but mature to take up certain functions. They get re-differentiated. Example – secondary cortex.