Thursday, January 22, 2009

Tropisms

What is the difference between phototropism, thigmotropism, and gravitropism? page 607

2 comments:

Rylee said...

A photopism is a directional movement in response to light. A thighmotropism is a growth response to touch. A gravitropism is a response to gravity.

Anonymous said...

Directional movements in response to light are called phototropisms. Growth responses to touch are called thigmotropisms. And responses to gravity are called gravitropisms.