HL 2 Biology

E.3a Innate Behavior

Innate behavior: animal behavior developed independently of the environmental context; genetically programmed

  • flatworms towards food

Learned behavior: behavior developed as a result of animal’s experiences

  • chimpanzees with twigs to get termites

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DBQ: Chemotaxis in woodlice (p.326)

1) Using light, as a phototaxis in one seeing their positive or negative movement or presence of plants/food as a geotaxis which may separate the two can be  another method for encouraging the woodlice to move out of the syringe into one of the arms.

2) For all species, more invertebrates were attracted to the scented than the unscented. Less were attracted to the unscented arm. At least half of the invertebrates of Porcellio Scaber and Armadillidium vulgar went to the unscented and double that to the scented.

3) The woodlice must have chemo-receptors because it is attracted to scent.

4) a) Woodlice may have entered the scented arm for finding their mates, in order to reproduce with them. Also, in order to follow their population of woodlice to confirm safety of the environment for survival.

b) Woodlice may have entered the unscented for protect and to avoid false identification of predators, for survival. The woodlice also may have noticed the presence of competition for mates, avoiding the scented arm.

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