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


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10 Questions MCQ Test Daily Test for NEET Preparation - Test: Dedifferentiation And Redifferentiation (July 9)

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Test: Dedifferentiation And Redifferentiation (July 9) - Question 1

All are extrinsic factors responsible for the development of an organism except

Detailed Solution for Test: Dedifferentiation And Redifferentiation (July 9) - Question 1

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.'

Test: Dedifferentiation And Redifferentiation (July 9) - Question 2

What is the best example of commitment?

Detailed Solution for Test: Dedifferentiation And Redifferentiation (July 9) - Question 2

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.

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Test: Dedifferentiation And Redifferentiation (July 9) - Question 3

What is the last stage of a plant called?

Detailed Solution for Test: Dedifferentiation And Redifferentiation (July 9) - Question 3

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.

Test: Dedifferentiation And Redifferentiation (July 9) - Question 4

Plasticity in plant growth means that

Detailed Solution for Test: Dedifferentiation And Redifferentiation (July 9) - Question 4

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.

Test: Dedifferentiation And Redifferentiation (July 9) - Question 5

The xylem which differentiates has a thick secondary wall made of

Detailed Solution for Test: Dedifferentiation And Redifferentiation (July 9) - Question 5
Well the correct answer is 'D'. because as you know xylem is the principle water conducting complex tissue in higher plants . so the water present in the xylem cells will be surely under negative pressure and to just avoid collapsing of walls of xylem cells , lignin is present. liginin is also less hydrophillic then other polysacchrides like cellulose and hemicellulose hence prevents absorption of water by them and allow an efficient pathway for transport of water in xylem. 
Test: Dedifferentiation And Redifferentiation (July 9) - Question 6

Which of the following are the products of redifferentiation?

Detailed Solution for Test: Dedifferentiation And Redifferentiation (July 9) - Question 6

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.

Test: Dedifferentiation And Redifferentiation (July 9) - Question 7

The dedifferentiated cells mature to form some specific cells to perform specific functions, this is referred to as

Detailed Solution for Test: Dedifferentiation And Redifferentiation (July 9) - Question 7

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'.

Test: Dedifferentiation And Redifferentiation (July 9) - Question 8

In which of the following process differentiated cell returned to their original specialized form?

Detailed Solution for Test: Dedifferentiation And Redifferentiation (July 9) - Question 8

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.'

Test: Dedifferentiation And Redifferentiation (July 9) - Question 9

The ability of the components of cells of callus to form a whole plant is known as

Detailed Solution for Test: Dedifferentiation And Redifferentiation (July 9) - Question 9

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)  

Test: Dedifferentiation And Redifferentiation (July 9) - Question 10

Examples of tissues that are formed by redifferentiation are

Detailed Solution for Test: Dedifferentiation And Redifferentiation (July 9) - Question 10

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'

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