Explain in 2-3 lines each of the following terms with the help of examples taken from different plant tissues:
(a) Differentiation
(b) De-differentiation
(c) Redifferentiation

Answers (1)

Ans.

(a) To facilitate growth, the meristematic cells through mitotic division, divide into daughter cells. The cells ranging from the root to the shoot apical meristem separate into different categories as they have matured and can perform specific functions. This phenomenon is called differentiation. During this phase, the cells experience critical structural modifications in protoplasm and cell wall.

(b) Under certain conditions, the differentiated living cells can divide mitotically after recovering the ability to divide. This phenomenon is called de-differentiation. Sometimes, the de-differentiated cell may become the meristem; for example, fully differentiated parenchyma cells form the meristems and interfascicular cambium and cork cambium.

(c) The cells formed by de-differentiated cells can lose their capacity to reproduce and thus mature to perform specific functions. This is known as redifferentiation. For example, the secondary cortex and cork are prime examples as well as the cambium which de-differentiates to form the cortex.

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