1. Response in Plants

2. Good morning! Get your notebooks and do the following:
Title the next blank page:
Response in Plants
Don’t forget to put it in your table of contents
Under the title write this essential question:
EQ: What are different types of plant responses?
Warm up:
What is xylem and what does it do?
What is phloem and what does it do?
What is a stoma and what does it do?

3. Plant Response Foldable
Take a piece of printer paper and make 3 tabs
Tape it on the left side of the page
Write these titles on the 3 tabs:
Phototropism
Thigmotropism
Gravitropism/Geotropism

4. Plant Response Foldable
Watch this video
Under the phototropism tab
Write your own definition about what happened in the video

5. Plant Response Foldable
Watch this video
Under the Thigmotropism tab
Write your own definition about what happened in the video

6. Plant Response Foldable
Watch this video
Under the Gravitropism/Geotropism tab
Write your own definition about what happened in the video

7. What are Tropisms?
A plants’ growth in a certain direction in response to a stimuli
2 categories:
Positive – toward a stimulus
Negative – away from a stimulus

8. What are the Types of Tropisms?
Definition
Picture
Phototropism
Tendency of a plant to grow toward a light source.
May only take hours to do this
Thigmotropism
Some plants respond to touch/stimuli
Gravitropism/Geotropism
Plants respond to gravity
If a plant is horizontal, the stem will build upward and the roots will bend downward

9. What are some plant hormones?
Auxins – controls growth and cell elongation, inhibits lateral (side) growth, stimulates root growth
Cytokinins – stimulates cell division, opposite of auxins
Gibberellins – stimulates growth and stimulates seed germination
Abscisic Acid – slows or stops cell division (growth), promotes seed dormancy
Ethylene – stimulates fruits to ripen, causes leaves to fall in autumn

10. Gallery Walk Make a table in your journal Station # Sketch
Type of response? How you know
Positive or negative?
How do you know? 1 2 3 4 5

11. Tropism lab
We will be seeing gravitropism by growing Radish seeds in groups
Day 1:
Set up seeds
Draw prediction
Day 2:
Record data on sheet
Answer conclusion questions

12. Exit ticket On a piece of paper: Write the 3 tropisms
Write a definition for each tropism
Write an example for each tropism