Question

Growth responses dependant on the direction of a stimulus are called ______

• A. apical dominance
• B. phototropism
• C. tropism
• D. gravitropism

Answer 1

The correct option is C

tropism

Plants can exhibit growth movements in response to an external stimulus. Responses which are dependent on the direction of the stimulus is called tropic movements. For example, response to light is called phototropism. When the movement is towards the direction of light, it is called positive phototropism and when it is opposite to the direction of light, it is called negative phototropism.