Plant Growth.

Plant growth is of two distinct types: primary growth and secondary growth. Primary growth results in increased length of stems or roots. Secondary growth increases the width of the plant and allows differentiation of cells into various distinct tissue types. Both types of growth occur in plant tissues called meristems. A meristem consists of tissue where extensive cell division takes place, and thus plant growth. There are two general types of meristems. Primary growth occurs at the apical meristems, and secondary growth occurs at the lateral meristems, which are known as the vascular cambium and the cork cambium.