AP BIOLOGY

Detailed explanation-1: -Instinct: an animal’s natural reaction to a stimulus. It is an automatic reaction that the animal was not taught to do. Animals natural instinct is to run away from danger.

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 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-4: -The simplest type of response is a direct one-to-one stimulus-response reaction. A change in the environment is the stimulus; the reaction of the organism to it is the response.

Detailed explanation-5: -Behavioral response (effect) refers to how animals cope or deal with changes in their environment (cause). Cold weather is the stimulus that causes some animals to hibernate to conserve food stored in the body (ex. bears).