AP BIOLOGY

Detailed explanation-1: -Complete Answer:-Haptonasti or thigmonasty is defiend as the non-directional movement of plants when their parts are in contact with any object.-When an insect comes in contact with Venus fly trap then it’s lamina is closed which is the type of haptonasti.

Detailed explanation-2: -One good example of positive thigmotropism is a leaf tendril, which moves towards the contact or support. This is unlike a thigmonastic stimulus, in which the direction of movement of the plant is irrespective of the direction of the stimulus. The Venus fly trap shows this type of movement.

Detailed explanation-3: -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-4: -Thigmotropism behavior causes the creeping plant to grow and coil around the tree and grow in an upward direction towards it. Ivies often use trees for climbing support. Some house or garden plants also show thigmotropic behavior, such as Morning glory, periwinkle, Money plants, Passion vines, Ivy plant, etc.

Detailed explanation-5: -Complete Answer:-Stems of the plant show negative geotropism while the roots show positive geotropism.