What is stimulus response?

What is stimulus response?

• A. The digestion of proteins
• B. The movement of molecules through membranes
• C. Irritability
• D. The exchange of gases

Answer: (C)

Stimulus response is the ability of an organism to detect changes in its environment and react to them. The term irritability specifically describes that responsiveness to stimuli, so it correctly captures the idea of reacting to something in the surroundings. The other options describe different processes: digestion of proteins is breaking down food, movement of molecules through membranes is transport across membranes, and the exchange of gases is part of respiration. Examples like a plant bending toward light or a person pulling away from something hot illustrate irritability in action.

Stimulus response is the ability of an organism to detect changes in its environment and react to them. The term irritability specifically describes that responsiveness to stimuli, so it correctly captures the idea of reacting to something in the surroundings. The other options describe different processes: digestion of proteins is breaking down food, movement of molecules through membranes is transport across membranes, and the exchange of gases is part of respiration. Examples like a plant bending toward light or a person pulling away from something hot illustrate irritability in action.