The term for growth in plants that moves towards light is called "phototropism." This phenomenon occurs when plants adjust their growth direction in response to light exposure, enabling them to maximize photosynthesis. The hormone auxin plays a significant role in this process by promoting cell elongation on the side of the plant that is away from the light source, allowing the plant to bend toward the light. This adaptive mechanism is crucial for plants' survival, helping them optimize their energy production and thrive in their environment.