Test: Dedifferentiation And Redifferentiation (July 9) - NEET MCQ

Light, amount of oxygen and temperature are extrinsic factors responsible for the development of an organism but hormones are intrinsic factors.
So the correct option is 'Hormones.'

The final structure at maturity of a cell/tissue is also determined by the location of the cell within. For example, cells positioned away from root apical meristems differentiate as root-cap cells, while those pushed to the periphery mature as epidermis.

Senescence also known as aging refers to the decrease in the functional capacity of an organism. This results in a cellular breakdown followed by metabolic failure. The death of cells followed by the death of plant part is seen in senescence. Thus the correct answer is option A.

Plasticity is the ability of the plant to adjust to a particular environment by altering the rate of growth, development and metabolism. It allows the initiation of the cell division from any tissue of the plant, ability to regenerate the lost organs and undergo several developmental pathway for its survival. Hence option 'B' is correct answer.

Redifferentiation is the event of losing the ability to divide by dedifferentiated cells, the plant tissue culture is an example of redifferentiation in which parenchyma cells are made to divide under controlled laboratory condition.
Interfasicular cambium and cork cambium are also examples of redifferentiation.
As guard cells are parenchymatous cells, which divide and then matures, it can also be considered as the example or product of it.

The living differentiated cells, that have lost the capacity to divide can regain the power of division under certain conditions, this phenomenon is termed as de-differentiation. E.g.,formation of meristerns-interfascicular cambium (Formed from medullary rays) and cork cambium (formed from outer layer of cortex) from fully differentiated parenchyma cells. While doing so, such meristems/tissues are able to divide and produce cells that once again lose the capacity to deride but mature to perform specific functions, i.e., get redifferentiated. E.g., cells of secondary xylem, secondary phloem, periderm. Thus rediffrentiation can be defined as maturation or differentiation of dedifferentiated tissues. So, the correct answer is 'Redifferentiation'.

Redifferentiation is the process in which the dedifferentiated cells lose their ability to divide.
A differentiated cell can regain its capacity for cell division under certain conditions. This phenomenon is called dedifferentiation.
Vernalization is the artificial exposure of plants (or seeds) to low temperatures in order to stimulate flowering or to enhance seed production.
So the correct option is 'Redifferentiation.'

Option (A): The process in which differentiated cells loses their ability to divide and later reformed from the dedifferentiated cells. 

This allows the cells to regain a specific function. 

Option (B): Dedifferentiation is a process which makes the cells less specialized in order to return to an original state in terms of functionality. 

Hence, the correct option is (B)  

Redifferentiation is the formation of new or differentiated tissue from a already differentiated tissue. During this process cells of parenchymatous tissue undergo dedifferentiation to meristematic tissue. The cells cut off by the meristematic tissue based on the location and function get modified to respective tissues like secondary cortex, secondary xylem and secondary phloem in roots, monocot stem, cork cells etc
So, the correct answer is 'All of these'