1. Look at the following pictures and describe what types of tropism you see. Are they positive or negative?

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18. Plant Tropisms Plant Tropisms Tropism Tropism _____________ is growth in response to an external stimulus (factor that elicits a response). _____________ is growth in response to an external stimulus (factor that elicits a response). _____________ tropism: Plant growth toward a stimulus (water, sunlight) _____________ tropism: Plant growth toward a stimulus (water, sunlight) _____________ tropism: Plant growth away from a stimulus (spilled gas, toxins, too much sun or not enough) _____________ tropism: Plant growth away from a stimulus (spilled gas, toxins, too much sun or not enough) Phototropism Phototropism ______________ is a change in the growth of a plant in response to light. ______________ is a change in the growth of a plant in response to light. The stalk displays ________________ phototropism growing towards the light. The stalk displays ________________ phototropism growing towards the light. Geotropism (Gravitropism) Geotropism (Gravitropism) _______________ is a change in the growth of a plant in response to gravity. _______________ is a change in the growth of a plant in response to gravity. The stalk displays a ______________ geotropism growing away from gravity. The stalk displays a ______________ geotropism growing away from gravity. The roots display a ______________ geotropism growing towards gravity. The roots display a ______________ geotropism growing towards gravity. Hydrotropism Hydrotropism ______________is a change in the growth of a plant in response to water. ______________is a change in the growth of a plant in response to water. The roots display a ______________ hydrotropism growing towards water. The roots display a ______________ hydrotropism growing towards water.