Tropisms Matching GameOnline version Tropisms Matching Game by Nathan Gurany 1 Phototropism 2 Geotropism 3 Thigmotropism Response to light Positive- Growth towards light Negative - None (Plants love this stimuli and need it to survive, Roots aren't affected) Phototropism Growth in response to gravity Positive- Roots grow down Negative- Shoots grow up towards sky Growth in response to touch Positive- Vines wrap around a pole or grow up a wall Negative- Roots avoid rocks in the soil