Question

Under certain conditions, regaining the lost capacity of division by living cells is called

• A. dedifferentiation
• B. redifferentiation
• C. differentiation
• D. efficiency index

Answer 1

The correct option is A dedifferentiation

Development is the process of whole series of changes which an organism goes through during its life cycle.
Meristems are the only cells, which have the capacity to divide and self-perpetuate.

The cells derived from root apical and shoot-apical meristems and cambium differentiate and mature to perform specific functions. This act leading to maturation is termed as differentiation.

The living differentiated cells, that by now have lost the capacity to divide can regain the capacity of division under certain conditions. This phenomenon is termed as dedifferentiation. For example, formation of meristems; interfascicular cambium and cork cambium from fully differentiated parenchyma cells. So the correct answer is option "a".

Also in some conditions plant cells undergoing dedifferentiation once again lose their capacity to divide and become mature. This process is called redifferentiation.

While efficiency index is the relative growth rate and the measure of ability of the plants to produce new material.