Examples from the Web for geotropism
Hence an agent which acts on the organ from outside, induces phototropic change earlier than variation in geotropism.
No phenomenon of tropic movement appears so inexplicable as that of geotropism.
Geotropism is a specific subject in the physiology of plants.
Thus I am now observing something about geotropism, and I had no idea a few weeks ago that this would have been necessary.More Letters of Charles Darwin Volume II|Charles Darwin
The root is thus supposed to be characterised by "positive" and the shoot by "negative" geotropism.