Plant responses part1

805 views
497 views

Published on

0 Comments
1 Like
Statistics
Notes
  • Be the first to comment

No Downloads
Views
Total views
805
On SlideShare
0
From Embeds
0
Number of Embeds
23
Actions
Shares
0
Downloads
30
Comments
0
Likes
1
Embeds 0
No embeds

No notes for slide

Plant responses part1

  1. 1. Plant Responses: Part 1<br />8SCIENCE: Wed. Feb. 16, Thurs. Feb. 17<br />
  2. 2. What are plant responses?<br />All living organisms will respond to a stimulus, including plants<br />A stimulus is anything in the environment that changes an organism’s behavior<br />Example: If you are sitting in a dark room watching a movie and you hear the telephone ring, you may jump. You have just responded to the stimulus by changing your behavior!<br />Examples of plant stimuli: light, temperature, amount of water, gravity <br />
  3. 3. Tropisms<br />Tropisms are responses of a plant to an outside stimulus<br /><ul><li>Outside of an organism
  4. 4. An example of an inside stimulus would be the beating of your heart</li></ul>We will learn about 3 types:<br />Thigmotropism<br />Phototropism<br />Gravitropism<br />
  5. 5. Thigmotropism<br />Thigma means touch in Greek <br />If you touch certain plants, this changes the plant’s behavior<br />E.g. in a pea plant, if something touches one of its stems/leaves, it will wrap itself around something<br />
  6. 6. Phototropism<br />When a plant responds to light: a plant will bend towards the light <br />If a plant is growing towards light, it is called positive phototropism<br />If it is growing away from the light, it is called negative phototropism<br />
  7. 7. Gravitropism<br />Response of a plant to gravity<br />Plants with roots growing downwards is called positivegravitropism<br />If plants have a stem growing upwards, it is called negativegravitropism<br />Click to see animation<br />

×