stimulus and response
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explain the advantage to organisms of being able to respond to stimuli
moves towards beneficial stimuli move away from harmful stimuli more likely to survive
define stimulus
a detectable change in the internal or external environment an organism, that leads to a response in that environment
define response
an action carried out by an organism in response due to a stimulus
define kinesis
a form of response where organisms move randomly
define taxis
a simple response where the direction of organism is determined by direction of a stimulus
what are the 2 types of taxis
positive taxis negative taxis
define positive taxis
organism moves entire body towards a favorable stimulus
define negative taxis
organism moves entire body away from an unfavorable stimulus
give 2 examples of types of taxis
phototaxis chemotaxis
define tropism
the growth of a plant in response to a directional stimulus cells elongate on one side of the structure so grow towards or away from stimulus
what are the 4 types of tropism
positive phototropism negative phototropism positive gravitropism negative gravitropism