Answer:
Cell enlargement and differentiation are two interrelated processes specially in plants.In plants both are consective, but not in animals.
Cell enlargement is most pronounced in shoot and root apices in plants.Cell enlargement takes place in 2nd growth zone just behind tip.Plant cell absorb water which is stored in vacuole as sap. this exerts pressure on cell wall which expands due to elasticity and cell enlarges upto150 times.In animals cell enlargement takes place during G1 phase of Interphase.
Differentiation is more complicated process which involves turning on of some specific genes and turnig off of some other genes eg in muscle cells genes controlling actin and myosin turn on while genes of pepsin turn off ,thus different types of cells are produced.