Growth : Growth may be defined as permanent or irreversible change in the size of a cell, organ or whole organism usually accompanied by an increase in dry weight.
Differentiation : Differentiation is the process whereby cells undergo few to major structural changes that lead to the maturation. The cells mature to perform specialized functions.
Development: Development includes all the series of changes which an organism goes through during its life cycle.
Dedifferentiation : It is the process by which the living differentiated cells which had lost the capacity to divide regain the capacity to divide under certain conditions.
Redifferentiation : Redifferentiation is defined as maturation or differentiation of dedifferentiated tissues.
Determination growth . The ability of a cell, tissue or the organism to grow for a limited period is called determinate growth.
Meristem : Meristem is a group of cells which have power of division and add new cells to the body.
Growth rate : It is the increased growth per unit time.
Auxins are of two types :
(1) Natural auxins : These are naturally occuring auxins, isolated from plants and are regarded as phytohormones e.g. IAA. NAA etc.
(2) Synthetic auxins : These are synthesized by artificially e.g. IBA 2,4-D etc.
Auxin was isolated by F.W. Went from tips of coleoptiles of oat seedling.