1 / 7

Plant responses

Plant responses. May 6, 2014. How are plants like other organisms?. They respond to stimuli That is they react to their environment How? Tropisms --automatic, movement of a plant in response to particular stimuli Can react by growing toward (positive) or away (negative).

tom
Télécharger la présentation

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 May 6, 2014

  2. How are plants like other organisms? • They respond to stimuli • That is they react to their environment • How? • Tropisms --automatic, movement of a plant in response to particular stimuli • Can react by growing toward (positive) or away (negative)

  3. How do plant actually grow in response to stimuli? • Plants release growth hormones that actually trigger certain plant cells to elongate causing the plant to actually bend • Ex. Auxins – cause plant cells to elongate • Are their others? • Yes, some trigger ripening, others cause color changes

  4. What are the different tropisms? • 1.Phototropism – growth of plants either toward or way from light • Negative type would be the growth of roots

  5. 2. Geotropism – growth in reaction to gravity • Causes plant roots to grow downward and shoots to grow upward • Which is positive and which is negative?

  6. 3. Thigmotropism – growth of objects in reaction to hard surfaces • Ex. Ivy growing up a wall

  7. Are there more? • Yes, • Hydrotropism, growth in relation to water • Skototropism, growth in relation to darkness

More Related