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chemical substance that regulates life functions and behaviors


A plant hormone that is involved in cell elongation


plant hormone that stimulates growth of stems


plant hormone that causes rapid growth by causing faster cell divisions


A growth response of a plant toward (positive) or away (negative) from a stimulus

Nastic Movement

where a plant responds to movement, but is not dependent on the direction of the stimulus. ex. Venus fly trap

Innate Behavior

behavior that an organism is born with and does not have to be learned, such as a reflex or instinct


a simple, automatic, inborn response to a sensory stimulus, such as the knee-jerk response

Flight or Fight Response

physiological response of the body to stress, which prepares the individual to take action by stimulating the vital defense system.


a complex inherited behavior pattern


type of behavior in which an animal sends out stimuli—such as sounds, visual displays, or chemicals—in order to attract a member of the opposite sex


A behavior in which an animal defends a bounded physical space against encroachment by other individuals, usually of its own species. Territory defense may involve direct aggression or indirect machanisms such as scent marking or singing.

Dominance Hierarchy

A linear "pecking order" of animals, where position dictates characteristic social behaviors.

Circadian Rhythm

a daily cycle of activity observed in many living organisms


the periodic passage of groups of animals (especially birds or fishes) from one region to another for feeding or breeding


decreasing responsiveness with repeated stimulation


the process by which certain animals form attachments during a critical period very early in life


(n) a clear; deep and sometimes sudden understanding of a complicated problem

Learned Behavior

Response to changes in the environment or internal conditions that are acquired during one's lifetime, as opposed to instinctive or automatic responses.

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