NEET BIOLOGY

Detailed explanation-1: -Solution: Touch. The growth movement of plants in response to the stimulus of touch is called thigmotropism. Thus, the stimulus for thigmotropism is “Touch”.

Detailed explanation-2: -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-3: -When subjected to constant directional pressure, such as a trellis, plants move to grow around the object providing the pressure; this process is known as thigmotropism. Thigmonastic responses include opening and closing leaves, petals, or other parts of the plant as a reaction to touch.

Detailed explanation-4: -(d) Water is the stimulus in hydrotropism. (e) Touch is the stimulus in thigmotropism.