MGSLG. (2020). Module 3 Unit 3

The role of auxins in geotropism and phototropism

  • Hormones control growth and development in plants
  • Auxin is an example of a hormone
  • Phototropism is the growth of a plant in the direction of a light source
  • Geotropism is the growth of a plant in response to gravity
  • The growth movement of phototropism and geotropism is due to chemical messengers (hormones) called auxins in a plant.




Remember: In plant stems/shoots, a high concentration of auxins STIMULATES cell division and growth, BUT in roots, a high concentration of auxins INHIBITS cell division and growth.



Last modified: Friday, 26 March 2021, 7:20 AM