2.79 Plants and Stimuli

• Stimuli are changes in the environment like temperature changes or light changes.
• The plants has receptor which can detect these stimuli and then turn this into responses often take the form of growth.
• This type of response growth in response to stimuli is called a tropism.
• Tropism that involve light is called a "phototropism" and another one is tropism involve to gravity which is called a "geotropism".
• The connection between the receptor and the response is usually take to form of plant hormones, sometimes called plant "growth regulaters". An example we will looking at later is Auxin.