Tropism
Published on Nov 18, 2015
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PRESENTATION OUTLINE
Difference Between Tropism/Stimulus
Positive tropism means it grows toward and negative means it grows away from.
Stimulus is a way of evoking the organism and stimuli is multiple ways.
Photo by kevin dooley
Gravitropism
A plants response to gravity.
Positive-Grows toward Earth
Negative-Grows away
Photo by BlueRidgeKitties
Phototropism
A plants response to light.
Positive-Grows toward light
Negative-Grows away
Photo by r_neches
An example of positive thigmotropism are vines because when they touch something they grow around it.
Photo by bobjudge
An example of negative thigmotropism is the Mimosa pudica plant because when touched the plants leaves will be retracted.
Photo by Roberto Verzo
Chemotropism
A plants response to chemicals.
Positive-Fertilizer
Negative-Weed killer
Photo by Andy.Schultz
