Tendrils respond to touch through thigmotropism, a growth phenomenon. When a tendril makes physical contact with a support, specialized cells known as pulvini perceive the touch. Rapid ion fluxes and changes in hormone distribution occur within these cells, inducing a rapid osmotic response. Water movement causes differential growth on the side facing the support, resulting in curvature and coiling around the object. This process allows the tendril to anchor securely and support the plant as it climbs. The touch-sensitive mechanism of pulvini ensures an adaptive and efficient response, enhancing the plant’s ability to find and utilize external structures for upward growth.