HORTICULTURE

Detailed explanation-1: -Examples of positive thigmotropism are the growth of ivy on walls upon contact to walls and the coiling of tendrils or twiners upon contact to objects for support. An example of negative thigmotropism is the growth of roots underneath the soil.

Detailed explanation-2: -An example of thigmotropism is the coiling movement of tendrils in the direction of an object that it touches. On the other hand, the folding movement of the Mimosa pudica leaflets, can be considered as an example of thigmonastism.

Detailed explanation-3: -The Bitter gourd is the plant exhibiting Thigmotropism whereas Mimosa pudica is the plant exhibiting Thigmonasty.