Test: Differentiation, Dedifferentiation, Redifferentiation & Development - 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.'

• Plasmodesmatal connections are not the characteristic cells of the phase of elongation, rather they represent the cells of the meristematic phase of growth.
• Some characteristics of the cells of the phase of elongation include increased vacuolation, cell enlargement and new cell wall deposition which gives strength to the existing cell wall.

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.