Which of the following did not arise due to regaining of specialisation by a meristematic cell?
As the stem continues to increase in girth due to the activity of vascular cambium, the outer cortical and epidermis layers get broken and need to be replaced to provide new protective cell layers. Hence, sooner or later, another meristematic tissue called cork cambium or phellogen develops, usually in the cortex region. Therefore, phellogen is formed by dedifferentiation.