AP BIOLOGY

Detailed explanation-1: -Some moths will fold their wings when they detect ultrasonic sounds from predators, such as bats. The moths fold up, drop to the ground, and hide in response to sensing the sounds. The sign stimulus is the ultrasonic sound, and the fixed action pattern is that they fold, drop, and hide.

Detailed explanation-2: -sign stimulus (releaser) The essential feature of a stimulus, which is necessary to elicit a response. For example, a red belly (characteristic of courting male sticklebacks) is the sign stimulus necessary to provoke an attack from a rival male; even a very crude model fish is attacked if it has a red undersurface.

Detailed explanation-3: -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-4: -Sign stimuli are often found when observing a fixed action pattern (FAP) that is an innate behaviour with very little variance in the manner in which the actions are executed. Several examples of sign stimuli can be seen through the observation of animal behaviour in their natural environment.

Detailed explanation-5: -There are different types of stress responses in an animal in response to stressors: Physiological responses, Behavioural responses, Psychological responses, and/or Physical responses (fight or flight). The response depends on the choice the animal partakes in, when it is faced with danger that causes distress.