Plants will always grow in the direction of a light source.
This film fragment was found on an old videotape underneath the large filing cabinet. Origin and date are unknown, but probably the film dates from the late forties. The rest of the tape was empty, so there is reason to believe this fragment was of great significance to Bob Tagge.
In this film a distinction is made between three forms of tropism:
- Geo tropism
- Photo tropism
- Stereo tropism