AP BIOLOGY

Detailed explanation-1: -The movement of plant due to touch is known as a thigmotropic movement. Thigmotropism is a directional growth movement which occurs as a mechanosensory response to a touch stimulus. For example, once a shoot touches a suitable support, it grows towards the surface it is touching.

Detailed explanation-2: -This is a type of rapid plant movement called thigmonasty or seismonasty or haptonasty and comes as a direct reaction to physical contact.

Detailed explanation-3: -Thigmotropism is similar to touch in humans. Thigmotropism is when a plant responds to a movement or touch from another stimulus. This stimulus is known as a contact stimulus.

Detailed explanation-4: -Thigmotropism is the directional response of a plant organ to touch or physical contact with a solid object. This directional response is generally caused by the induction of some pattern of differential growth. This phenomenon is clearly illustrated by the climbing tendrils of some plants, such as the sweet pea.

Detailed explanation-5: -When the root encounters a rigid object, the thigmotropic response is activated and ethylene production is down-regulated, leading to the root to bend while growing rather than growing straight. Like phototropism, a thigmotropic response in stems requires light.