AP BIOLOGY

Detailed explanation-1: -A vine plant brushes against a fence and wraps itself around the fence. To what stimulus is the plant responding? Plant grows toward the direction of sunlight.

Detailed explanation-2: -Answer and Explanation: The directional growth of a plant body in response to a touch stimulus is referred to as THIGMOTROPISM. Thigmotropism is most commonly exhibited by the coiling action of tendrils of vine plants.

Detailed explanation-3: -Thigmotropism is the type of tropic movement which occurs in response to touch. Similarly, phototropism, chemotropism and hydrotropism occur in response to light, chemicals and water respectively.

Detailed explanation-4: -Thigmotropism is a directional growth movement which occurs as a mechanosensory response to a touch stimulus. Thigmotropism is typically found in twining plants and tendrils, however plant biologists have also found thigmotropic responses in flowering plants and fungi.

Detailed explanation-5: -The plant responds to many types of external stimuli such as light, gravity, weather, and touch. The response of a plant is either positive (grow towards the stimulus) or negative (grow away from the stimulus). For example, phototropism is the plant’s response to stimulus, i.e. sunlight.