I used to be fascinated by mimosa plants, that suddenly fold up their leaves and lower
their branches when touched. There are a couple words for this: Thigmatropism is one.
I have a book that says haptotropism is another, but I can't confirm this on Internet.
At first I had thigmatropism confused with thixotropic, which was term for behaviour
of a penicillin preparation that was like very thick cream, but when you put needle into
vial and pulled back on plunger, it flowed as readily as water.
We've all seen plants that put out tendrils that when they touch a potential support,
wrap around it more and more as growing plant becomes heavy. Grapes, ivy, etc. for
instance. My book says this is called haptotropism, response to touch.