2Set Up Foldable Tropism Phototropism Geotropism Thigmotropism Fold Long and Skinny (hotdog)Fold short and fat 2 times (hamburger)Open so looks like below, crease is on topTropismPhototropismGeotropismThigmotropism
3Tropism ~ a response of a plant to an environmental stimulus. What is a tropism?Tropism ~ a response of a plant to an environmental stimulus.
4TropismTropism is growth in response to an external stimulus (factor that elicits a response).Positive tropism: Plant growth toward a stimulus (water, sunlight)Negative tropism: Plant growth away from a stimulus (spilled gas, toxins, too much sun or not enough)
5Phototropism ~ a tendency of plants to grow toward a source of light. What is phototropism?Phototropism ~ a tendency of plants to grow toward a source of light.
6PhototropismPhototropism is a change in the growth of a plant in response to light.The stalk displays positive phototropism growing towards the light.
7What is gravitropism?Gravitropism ~ a tendency of a plant to grow in a direction in response to the force of gravity.
8Thigmotropism ~ the response of plants to touch. What is thigmotropism?Thigmotropism ~ the response of plants to touch.
9Geotropism (Gravitropism) Geotropism is a change in the growth of a plant in response to gravity.The stalk displays a negative geotropism growing away from gravity.The roots display a positive geotropism growing towards gravity.
10HydrotropismHydrotropism is a change in the growth of a plant in response to water.The roots display a positive hydrotropism growing towards water.
11Turgor Pressure http://www.kscience.co.uk/animations/turgor.htm Click on link above for example
13No Turgor Pressure Low Turgor Pressure Full Turgor Pressure Plant is dead.Plant iswilted.Plant ishealthy / balanced.The cell is flaccid.The vacuole does nothave a lot of water in it.The vacuole and cell wall push against each other.The vacuole is now full of water.The cell’s vacuole does not have any water in it.