REVISION NOTES
IGCSE Edexcel Biology
a
2.14 Coordination and Response (in Plants)
2.14.1 Understand how organisms are able to respond to changes in their environment
2.14.2 Understand that homeostasis is the maintenance of a constant internal environment, and that body water content and body temperature are both examples of homeostasis
2.14.3 Understand that a co-ordinated response requires a stimulus, a receptor and an effector
2.14.4 Understand that plants respond to stimuli
2.14.5 Describe the geotropic and phototropic responses of roots and stems
![](https://resource.studiaacademy.com/wp-content/uploads/2023/08/edexcel_igcse_biology_topic-16_coordination-and-response-in-plants_002_geotropism.png)
2.14.6 Understand the role of auxin in the phototropic response of stems
![](https://resource.studiaacademy.com/wp-content/uploads/2023/08/edexcel_igcse_biology_topic-16_coordination-and-response-in-plants_004_auxins-in-phototropism.png)