1. Plant Responses

2. TROPISM
Plant movement in response to an environmental stimulus -Caused by hormones

3. TROPISM POSITIVE NEGATIVE If the plant moves TOWARD the stimulus
If the plant moves AWAY from the stimulus

4. Phototropism
Movement of plants toward light

5. Gravitropism (Geotropism)
Movement of plants in response to gravity
Positive is toward gravity (roots grow down)
Negative is away from gravity (shoot, stems, and leaves grow up)
Allows plants to grow properly and get nutrients and sunlight

6. Thigmotropism Plants moving in response to touch.
Positive is toward touch (vines wrap around structures)
Negative is away from touch (some plants close up when touched)

7. TROPISM QUIZ
Identify the type of tropism in the following pictures

8. Gravitropism

9. Phototropism

10. Gravitropism

11. 2

12. 3

13. 4

14. Watch the Tropisms Prezi to see video examples