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According to our high school Biology book and several web-sites, "thigmotropism is the directional response of a plant organ to a touch or physical contact with any solid object. The response is usually caused by the adding of some pattern of differential growth." Thigmotropism can be seen in the climbing tendrils of some plants, such as morning glories or climbing roses. The tendrils actually "feel" the pole or object they come into contact with, and this pressure results in a coiling response around the pole or the object those tendrils come into contact with. 

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