Animal Behavior Types

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B.Sc. Part-I Paper - II Animal Behavior: Innate Presented by : ShushmaKumari HOD & Assistant Professor, Zoology, J. D. W. College, Patna The first type is innate behavior. From Latin . innatus "inborn,“ Innate behaviors are those you develop on your own, which do not need to be taught or learned. Innate behavior is something the animal is born knowing how to do. Examples include fish swimming and geese migrating. What other examples can you think of? Innate behavior Behavior determined by the "hard-wiring" of the nervous system is Innate behavior . It is usually inflexible, a given stimulus triggering a given response. Example: A salamander raised away from water until long after its siblings begin swimming successfully will swim every bit as well as they the very first time it is placed in the water. Clearly this rather elaborate response is "built in" in the species and not something that must be acquired by practice. Types of innate behavior Irritability Tropism Nasties Taxis Kinesis Reflex action Instinct Motivation Let‘s study detail Types if innate behavior 1: Irritability def.: Irritability is an excessive response to stimuli. Conditions Irritability can occur in people experiencing any of a variety of conditions, including: Anxiety Alcoholism Fever 2: tropism : Cause of name: (from Greek trope, "a turning") Def: it is a biological phenomenon, indicating growth or turning movement of a biological organism, usually a plant, in response to an environmental In tropisms, this response is dependent on the direction of the stimulus Tropisms are typically associated with plants. Types of tropism Chemotropism, movement or growth in response to chemicals Geotropism (or gravitropism), movement or growth in response to gravity Heliotropism, movement or growth in response to sunlight Sonotropism, movement or growth in response to sound. Hydrotropism, movement or growth in response to water Phototropism, movement or growth in response to lights or colors of light (e.g.- the sunflower) Types of tropism Thermotropism, movement or growth in response to temperature Electrotropism, movement or growth in response to an electric field Thigmotropism, movement or growth in response to touch or contact 3:nasties Def: these Are non directional responses to stimuli (e.g. temperature, humidity, light irradiance), and are usually associated with plants The movement can be due to changes in turgor or changes in growth. Nastic movements differ from tropic movements in that the direction of tropic responses depends on the direction of the stimulus, whereas the direction of nastic movements is independent of the stimulus' position. Types of nasties Epinasty: downward-bending from growth at the top, for example, the bending down of a heavy flower. Photonasty: response to light Nyctinasty: movements at night or in the dark Chemonasty: response to chemicals or nutrients Hydronasty: response to water Thermonasty: response to temperature Geonasty/gravinasty: response to gravity Thigmonasty/seismonasty/haptonasty: response to contact Examples of nasties To be contd….

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