1. PLANT TROPISM

2. Objectives Identify tropisms in plants.
Examine effects of tropisms in plants.
Recall differences in tropisms and effects of tropisms in plants.

3. What is Tropism?
A growth movement whose direction is determined by the direction of the stimulus.
Tropisms cause a change in growth pattern.

4. Two Types of Tropisms
1. Positive Tropism
2. Negative Tropism

5. Grows in the direction from which the stimulus originates .
Positive Tropism
Grows in the direction from which the stimulus originates .
Growth toward the sun is a Positive Phototropism

6. Negative Tropisms Growth away from gravity is a Negative Geotropism
Growth away from the stimulus.
Growth away from gravity is a Negative Geotropism

8. 4 TYPES OF TROPISMS Phototropism Geotropism (Gravitropism)
Hydrotropism
Thigmotropism

9. PHOTOTROPISM
Response to light

10. GEOTROPISM or GRAVITROPISM
Response to gravity

11. HYDROTROPISM
Response to water

12. THIGMOTROPISM
Response to touch

13. Summary 4 Types of Tropisms What is a tropism?
A growth movement towards a stimulus.
4 Types of Tropisms
Phototropism-growth toward light.
Geotropism-growth due to gravity.
Hydrotropism-growth toward water.
Thigmotropism -growth due to touch.