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The problem with the notion of tropism is that it can be difficult to judge an intelligent response from an unintelligent one. I'd say that for something to be a tropism, there has to be something that is done that would not normally be done that either benefits the preservation/replication of the object performing the action, or one of its fellows.
Otherwise, we might imagine intelligence and motive in all manner of situations.
e.g.
Rocks prefer to lie at the bottom of hills, and have evolved to erode into rounded shapes that easily roll down slopes.
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