Response to stimuli refers to how living organisms react to changes in their environment. This can include physical changes, like moving away from danger, or physiological changes, such as sweating when it's hot. Organisms detect stimuli through specialized cells and systems, allowing them to adapt and survive. In animals, the nervous system plays a crucial role in processing stimuli and coordinating responses. For example, when a dog hears a loud noise, it may bark or run away. Similarly, plants can respond to light by growing towards it, demonstrating that response to stimuli is essential for both animals and plants.