Which Process Occurs When a Grapevine Wraps Around a Trellis

Question

Which process occurs when a grapevine wraps around a trellis or another supporting structure?
A) photoperiodism
B) thigmotropism
C) gravitropism
D) phototropism

Accepted Answer

Thigmotropism is the growth of a plant in response to touch or physical contact with a solid object. When a grapevine wraps around a trellis or another supporting structure, it is demonstrating thigmotropism as it responds to the touch and support of the structure. Photoperiodism is a plant's response to changes in day length, gravitropism is a plant's response to gravity, and phototropism is a plant's response to light. None of these processes accurately describe the behavior of a grapevine wrapping around a structure.