Growth: Growth in the size, weight, area. length, height, volume, cells of an organism or any part of it. There is an irreversible increase in numbers etc.
Differentiation: The cells formed from root apical and shoot apical meristem and cambium cells get modified for different functions and mature to perform specific activities. This process leading to maturity is called differentiation.
Development: Development includes all those changes that occur in the life cycle of an organism between germination and senescence. This forms the complex body of the plant, in which roots, stem, leaves, flowers and fruits are formed. All these come under development.
De-differentiation: Surviving differentiated cells can regain the ability to divide under certain conditions. This ability is called de-differentiation.
Re-differentiation:The cell produced from undifferentiated cells/tissues later loses the ability to divide again so as to perform specific functions i.e. gets re-differentiated.
Determinate growth: All trees and plants continuously increase in height and width over a period of time. Although the leaves, flowers and fruits etc. of the same tree are not only of a limited length and width. but also come out and fall from the tree as per the time. This process is repeated continuously. This is determinate growth.
Meristem: Meristems are responsible for the primary growth of plants and are mainly involved in elongation parallel to the plant axis. These meristems increase the width of the organs where they are active.
Growth rate: The increase in growth per unit of time is called growth rate. In mathematical language, an organism or its organs can produce more cells in many ways.