Question

Movement stimulated by external factor is

• A. Spontaneous movement
• B. Autonomic movement
• C. Physical movement
• D. Paratonic movement

Answer 1

The correct option is D Paratonic movement

Autonomic movement is the spontaneous movement of the protoplasm seen in aquatic plants due to internal stimulus. It is not related to the external stimulus. Movement of cilia and flagella is an example of autonomic movement. A movement shown by a plant part in response to an external factor is called as paratonic movement. In this, the direction of movement is controlled by the direction of the stimulus.

Thus, the correct answer is option D.