AP BIOLOGY

Detailed explanation-1: -Answer and Explanation: A signal to which an organism responds is called stimulus. A stimulus is a signal that directs an organism to behave in a particular manner.

Detailed explanation-2: -Animals may respond to environmental stimuli through behaviors that include hibernation, migration, defense, and courtship. As a result of cold, winter weather (stimulus) some animals will hibernate. Hibernation is a state of greatly reduced body activity, used to conserve food stored in the body.

Detailed explanation-3: -The correct option is A sensitivity. The stimulus(singular) is any change in the organism’s internal or external environment that causes the organism to react. The ability of an organism to respond to external stimuli is called sensitivity.

Detailed explanation-4: -An example of stimulus in animals is the sight of another animal (especially predators) where they respond by fleeing away or fighting. In animals, most of the responses as a result of stimulus are of instinctual nature. An ostrich can run at a speed of 70km/h when stimulated by some danger.

Detailed explanation-5: -Response to stimulus is a change in state or activity of a cell or an organism (in terms of movement, secretion, enzyme production, gene expression, etc.) as a result of a stimulus. Parent Terms: is-a regulation of biological process.