Answer:
(a) Differentiation is
permanent in size, structure, composition and function of cells, tissue or
organs. For example the meristematic tissues in plants gives rise to new cells
which mature and get differentiated into special tissue or an organ of the
plant, e.g., cells, distal to root apical meristem form root cap, cell of the
periphery form epiblema, followed by cortex, endodermis, pericycle and
vascular.
(b)
De-differentiation is the process of despecialisation of differentiated cells
so that they again become differentiated and able to divide, e.g., in dicot
stem, the cortical cells get de-differentiated and become meristematic to form
cambium (inter fascicular cambium, and fascicular cambiums).
(c)
Re-differentiation The cambium cells thus formed, again re-differentiate to
form secondary cortex cells secondary xylem and phloem elements and phelloderm
in case of secondary growth of woody dicot plants.
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