DENDROLOGY

Detailed explanation-1: -The correct option is D Thigmotropism. 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: -Thigmotropism can be defined as the movement of a plant part in response to touch. It can also be defined as the curvature movement of plant parts like tendrils in response to the stimulus of contact or friction with some other object.

Detailed explanation-3: -Thigmotropism is an example of tropism and it may be positive or negative. A positive thigmotropism is a response towards the touch stimulus whereas a negative thigmotropism is a response away from the touch stimulus.