NEET BIOLOGY

Detailed explanation-1: -Nastic movements in plants are reversible and repeatable movements in response to a stimulus whose direction is determined by the anatomy of the plant. Examples include the diurnal movement of leaves and the response of insectivorous plants, such as the Venus fly trap, to prey.

Detailed explanation-2: -The folding up of leaves belonging to a sensitive plant such as Mimosa pudica is an example of nastic movement. The stimulus for this movement is “touch”. Hence this movement is also called thigmonasty.

Detailed explanation-3: -Solution : Response of plants due to reversible turgor change in pulvnnus as a result of touch is seismonasty.

Detailed explanation-4: -Hyponasty. Photonasty: response to light. Nyctinasty: movements at night or in the dark. Chemonasty: response to chemicals or nutrients.

Detailed explanation-5: -Nastic movements are different from tropic movements called tropisms. Tropisms are directional movements or growth responses of a plant to the stimulus. In nastic movements, the response of the plant is non-directional. An example of tropism is thigmotropism, which is a growth response to the touch stimulus.