NEET BIOLOGY

Detailed explanation-1: -Seismonasty is a nastic movement in response to shock, especially the rapid folding of the leaflets of the sensitive plant due to changes in turgor pressure, caused by vibration, example-Mimosa pudica.

Detailed explanation-2: -The Venus Flytrap (Dionaea muscipula) presents a spectacular example of thigmonasty; when an insect lands on a trap formed by two curved lobes of a single leaf, the trap rapidly switches from an open to a closed configuration.

Detailed explanation-3: -Leaves of Mimosa pudica are sensitive. When touched the stimulus reaches the base of the leaf and the water in the vacuoles of the cells of the leaf loses water to the adjacent cell. All the water escapes the leaf which then becomes flaccid. This causes the leaves to close.

Detailed explanation-4: -Movement of leaves of touch-me-not plant is a nastic movement whereas growth of stem towards light is a tropic movement. The growth of stem is a direction based movement i.e. it grows towards the stimulus of light.

Detailed explanation-5: -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.