A strip of secondary meristem located in the cortex of older plants forms cork tissue, which constitutes the outer protective layer. This process is known as cork cambium activity.

Tissues in both plants and animals are groups of cells that work together to perform specific functions, such as support, transport, or protection, contributing to the overall structure and physiology of the organism.

Division of labour refers to the specialization of cells to perform specific functions, with different groups of cells dedicated to different tasks, leading to increased efficiency in multicellular organisms.