BIOMOLECULES AND ENZYMES

Detailed explanation-1: -The ability of an organism to respond to external stimuli is called sensitivity. For example, Plants grow towards light(external stimuli) sources, and if the direction of light is changed, the plant will also change its direction of growth to accommodate for survival. So, the correct answer is ‘Sensitivity’.

Detailed explanation-2: -A response is the behavior that is manifested by a living organism which is the result of an external or internal stimulus. A stimulus is anything that causes you to react, for example, the smell of food and your mouth watering. Responses are actions of the body: muscle contractions, gland secretions, or brain actions.

Detailed explanation-3: -In physiology, a stimulus is a detectable change in the physical or chemical structure of an organism’s internal or external environment. The ability of an organism or organ to detect external stimuli, so that an appropriate reaction can be made, is called sensitivity (excitability).