1 / 8

Plant Tropisms

Plant Tropisms. The movement or growth of a plant in response to a stimulus…. Some of these ways are:. Tropism Phototropism Geotropism Hydrotropism Turgor Pressure Thigmotropism. Plant Tropisms.

lacey-kidd
Download Presentation

Plant Tropisms

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Plant Tropisms The movement or growth of a plant in response to a stimulus…

  2. Some of these ways are: • Tropism • Phototropism • Geotropism • Hydrotropism • Turgor Pressure • Thigmotropism

  3. Plant Tropisms • Tropism is growth in response to an external stimulus (Stimulus is a factor that elicits a response). • Positive tropism: Plant growth toward a stimulus (Ex. water, sunlight) • Negative tropism: Plant growth away from a stimulus (Ex. spilled gas, toxins, too much sun or not enough)

  4. Phototropism • Phototropism is a change in the growth of a plant in response to light. • The stalk displays positive phototropism growing towards the light.

  5. Corn Dance After 3 days of growth in darkness, the pot of corn seedlings in this movie were exposed to light from a single light bulb placed in the center of the pot just above the seedling. The plants were then imaged at 10 min intervals for about 18 hours. For the first 14 hours the seedlings appear to be dancing to the light as they maintain phototropic curvature. Since geotropism is simultaneously affecting the seedlings, the curvature that develops is a compromise between the opposing light and gravity responses. After 14 hours, the point light source was turned off and diffuse room lighting was turned on, at which point geotropism becomes the dominant stimulus and the seedlings quickly return to a vertical orientation. Frame playback is at 12 frames per sec.

  6. Geotropism (Gravitropism) • Geotropismis a change in the growth of a plant in response to gravity. • The stalk displays anegativegeotropism growing away from gravity. • The roots display apositivegeotropism growing towards gravity. Negative Positive

  7. Hydrotropism • Hydrotropism is a change in the growth of a plant in response to water. • The roots display apositivehydrotropism growing towards water. Positive Water

  8. Thigmotropism Write the definition and illustrate it. Label your illustration as you would any scientific drawing. • Thigmotropism is a movement in which an organism moves or grows in response to touch or contact stimuli. • Thigmotropism usually occurs when plants grow around a surface, such as a wall, pot, or trellis. ...but it could be a venus fly trap.

More Related