When plants grow in response to a stimulus, it is referred to as _______________

The correct answer is: Tropism

The correct option is c) Tropism.

• Tropism is a biological phenomenon that exhibits the growth or rotational movement of organisms (usually plants) in response to environmental stimuli.
• In tropism, this response depends on the direction of the stimulus (unlike nastic movement, which is a directionless response).
• Tropism is usually named after the stimulus involved (for example, phototropism is the response to sunlight).
• Tropism can be distinguished according to its orientation relative to the direction of stimulation. They are usually either positive (toward the stimulus) or negative (away from the stimulus).