tropism

zacharymenefee//1-31-14/5thperiod

tropism

involuntary orientation by an organism or one of its parts that involves turning or curving by movement or by differential growth and is a positive or negative response to a source of stimulation

geotropism

: a tropism (as of plant roots) in which gravity is the orienting factor ex.As mentioned above, if you take a house plant and turn it on its side it will eventually exhibit positive geotropism in the roots and negative geotropism in the stem

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phototropisms

is the growth of organisms in response to light ex. phototropism is growth toward a light source
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