1. Tropisms and Turgor Pressure
TEKS 7.7C

2. Tropism -
The response of plants to external stimuli

3. Phototropism - The tendency of a plant to grow towards light

4. Geotropism (Gravitropism) - The tendency of a plant to grow in a direction in response to gravity (roots-down)

5. Geo and Phototropism

6. Thigmotropism - Response of plants to touch such as in vines and climbing plants on trees

7. Thigmotropism in a Venus Fly Trap

8. Turgor Pressure
Water pressure in a cell that pushes against the cell membrane and cell wall. It makes plants cells firm and rigid. Loss of it is referred to as wilting.

12. Cool Turgor Pressure Video