To reach a large tree, the most useful kind of growth movement for a tropical vine presumably would be positive gravitropism.
A stimulus is a component of an environment or an experience that an organism can sense using any of its senses. Plants can still sense their environment and react to stimuli like light, moisture, and gravity despite being sessile or grounded organisms. Thus, a plant's movement or growth in response to gravity-related stimuli is defined as gravitropism.
Positive gravitropism describes growth that moves downward and parallels the pull of gravity (or toward the center of the earth). This type of growth is typical of primary roots, which are required for adequate water and nutrient absorption as well as secure soil anchorage.
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