Look at the following Look at the following pictures and describe pictures and describe what types of tropism what types of tropism

you see. Are they you see. Are they positive or negative?positive or negative?

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Plant TropismsPlant Tropisms TropismTropism __________________________ is growth in response to an external stimulus is growth in response to an external stimulus

(factor that elicits a response).(factor that elicits a response). __________________________ tropism: Plant growth toward a stimulus (water, tropism: Plant growth toward a stimulus (water,

sunlight)sunlight) __________________________ tropism: Plant growth away from a stimulus (spilled tropism: Plant growth away from a stimulus (spilled

gas, toxins, too much sun or not enough)gas, toxins, too much sun or not enough) PhototropismPhototropism ____________________________ is a change in the growth of a plant in response to is a change in the growth of a plant in response to

light.light. The stalk displays The stalk displays ________________________________ phototropism growing phototropism growing

towards the light.towards the light. Geotropism (Gravitropism)Geotropism (Gravitropism) ______________________________ is a change in the growth of a plant in response is a change in the growth of a plant in response

to gravity.to gravity. The stalk displays a The stalk displays a ____________________________ geotropism growing away geotropism growing away

from gravity.from gravity. The roots display a The roots display a ____________________________ geotropism growing towards geotropism growing towards

gravity.gravity. Hydrotropism Hydrotropism ______________is a change in the growth of a plant in response to ______________is a change in the growth of a plant in response to

water. water. The roots display a The roots display a ____________________________ hydrotropism growing towards hydrotropism growing towards

water.water.