While observing a section of plant stem, Aditi observed that in certain areas, cells are irregularly thickened at the corners

While observing a section of plant stem, Aditi observed that in certain areas, cells are irregularly thickened at the corners. She asks her teacher for identification of this region. State the role of epidermis.

The region of plant stem observed contains collenchymatous tissue, where the cells are irregularly thickened at the corners due to deposition of extra cellulose.