2.79 Plants and Stimuli

- Stimuli are changes in the environment (e.g. temperature, light)
- Plants have receptors which detect stimuli and turns into a response
- Responses take the form of growth - this type of response (growth in response to stimulus) is called a Tropism
- Tropisms involving light = Phototropism
- Tropism involving response to gravity = Geotropism
- Connection between receptor and response takes form of plant hormones called Plant Growth Regulators (e.g. Auxin)