Question

Movement caused by injury is
A)Traumatropism
B)Rheotropism
C)Traumonasty
D)Rheonasty

Answer 1

The plant shows two types of movement as a response to the external stimuli. The tropic movement is mainly a type of growth movement in response to stimuli. For example phototropic movement (movement of stem towards sunlight). The other movement is the nastic movement which is movement of the plant in response to stimuli but is independent of the direction of the stimuli. For example seismonastic movement of mimosa.

Complete answer:
To solve this question, we must know about the type of movement in response to injury.
Let us discuss the options given.
Traumatropism- It is the growth or involuntary movement of the plant as a result of injury. This is mainly exhibited by the roots. The unilateral trauma caused to the tip of the root causes the bending of roots in the opposite direction to that of stimulus. This is called negative traumatropism.
Rheotropism- It is the growth movement in response to the stimuli of the running water. Example- aquatic plants and animals.
Traumonasty- It is the folding of the leaves in response to injury. It is not a growth movement.

Hence, the correct answer is option (A)

Note: The nastic movement of plants is reversible and is dependent on the stimuli. The plant parts regain its original orientation on the removal of stimuli. The tropic movement is rather irreversible and grows in direction of the stimuli is called the positive tropism and in the opposite direction to the stimuli is negative tropism.