NEET BIOLOGY

PLANT PHYSIOLOGY

PLANT MOVEMENT

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
What type movement is shown by the closing of “Ngirum-kirum” (Mimosa pudica) leaves when touched?A. PhotonasticB. ThigmotropismC. ThigmonasticD. thermotropism
A
Photonastic Movement
B
Thigmotropism
C
Thigmonastic
D
Thermotropism
Explanation: 

Detailed explanation-1: -The leaves of Mimosa have the capability to display thigmonasty (touch-induced movement). In the sensitive plant, the leaves respond to being touched, shaken, heated or rapidly cooled. The speed of the response depends on the magnitude of the stimulus.

Detailed explanation-2: -The folding and opening of the leaflets of a mimosa plant depend on changes in turgor pressure. Mimosa plants fold their leaflets in response to being touched or shaken, called thigmonasty, and in response to light/dark cycles, called nyctinasty.

Detailed explanation-3: -Explanation: The type of movement is shown by mimosa pudica (Touch-me-not) Plant is seismotropic movement.

Detailed explanation-4: -An example of thigmotropism is the coiling movement of tendrils in the direction of an object that it touches. On the other hand, the folding movement of the Mimosa pudica leaflets, can be considered as an example of thigmonastism.

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