______ substances are components of living matter and _____ are non-living substances formed by cells.
The process of increase in size, mass or height of an individual is known as growth. It can occur by cell division or cell expansion. There are two types of growth producing substances: protoplasmic and apoplasmic. Protoplasmic substances are components of the living matter of the cell. They are responsible for the intrinsic growth of the cell. For example, cytoplasm and nucleus. Apoplasmic substances are the non living materials formed by the cells such as cell wall, bone matrix, fibers.
Intussuspection and accretion are the two types of growth. When there is addition of material and formation of the cells inside the organism, the growth is known as intussusception. The increase in size due to deposition of material on the external surface is known as extrinsic growth or accretion.