1. Plant Responses
Tropisms

2. Touch
Thigmotropism
Example: Pea plant grows faster on one side of its stem than the other side causing the stem to bend and twist around any object it touches.
Other examples: vines, Venus’s-fly trap

3. Light
Phototropism
Positive Example: A plant growing towards a light. Cells on opposite side of light get longer than the cells facing the light.

4. Gravity Geotropism or Gravitropism Positive and Negative
Positive Example: Downward growth of plant roots.
Negative Example: Plant stems growing upward away from gravity.

5. http://plantsinmotion. bio. indiana