Ohio State University
The Ohio State University: Plant Hormones
Page offers an explanation of plant hormones, including auxin and ethylene.
CK-12 Foundation
Ck 12: Life Science: Plant Hormones
[Free Registration/Login may be required to access all resource tools.] Plants may not move, but that does not mean they don't respond to their environment. Plants can sense gravity, light, touch, and seasonal changes. Learn more about...
BiologyWise
Biology Wise: Plant Hormones and Their Functions
Describes five different types of hormones that regulate plant processes - auxins, cytokinins, ethylene, abscisic acid, and gibberellins.
CK-12 Foundation
Ck 12: Life Science: 7.12 Plant Hormones
Understand how plant hormones allow plants to live in their environment.