2.81 Phototropism

Positive Phototropism:
- Photo = light, Tropism = growth in response to light
- Positive = growth towards the light
- Stem: (example of positive phototropism growth)
- It will grow forwards and upwards when there is light coming from all directions
- The plant bends in the growth towards the lateral light source because the light causes the movement to the opposite side of a compound: Auxin (plant hormone) which causes more growth on the opposite side than the side which has light, therefore, the plant bends.