1 / 8

Plant Responses

Plant Responses. Part 4. Stimulus and Response. Stimulus – causes a response Response – reaction to a stimulus Ex: clapping in someone’s face Stimulus – clap Response – flinching. Tropisms. Plant’s response to an external stimulus Not reversible, but can change direction

elinor
Download Presentation

Plant Responses

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 Responses Part 4

  2. Stimulus and Response • Stimulus – causes a response • Response – reaction to a stimulus • Ex: clapping in someone’s face • Stimulus – clap • Response – flinching

  3. Tropisms • Plant’s response to an external stimulus • Not reversible, but can change direction • Positive tropism – grows towards stimulus • Negative tropism – grows away from stimulus

  4. Types of Tropisms • Phototropism – response to light • Gravitropism – response to gravity • Thigmotropism – response to touch • Nastic responses – response to stimulus, but doesn’t have a direction

  5. Phototropism • Positive – plants grow towards light • Negative – plants grow away from light • Stems are positive for phototropism • Roots are negative for phototropism

  6. Gravitropism • Positive – plants grow towards (down) gravity • Negative – plants grow away (up) from gravity • Stems are negative for gravitropism • Roots are positive for gravitropism

  7. Thigmotropism • Growth response to touch • Some plants grow towards something to touch • Ex: vines growing up a wall, tomato plants growing up a stick, etc.

  8. Nastic Response • Doesn’t deal with plant growth • More immediate response • Some plants will close up when close to heat or fire • Venus fly traps snap shut when they are touched by insects

More Related