Question

Explain the Nastic movement in Mimosa Pudica?

Answer 1

These movements are brought about by mechanical stimuli such as contact with a foreign body, fast wind and rain drops etc. Seismonastic movements are seen in stigmas, stamens and leaves of many plants. For instance, movements of leaf lets in Mimosa pudica (Sensitive plant, Fig. 7.14), Biophytum sensitivum and Neptunia, etc.



Stigma lobes in certain plants such as Mimulus, Martynia and Bignonia, etc., encircle the pollengram as soon as it falls over them Stamens of Berberis, Portulaca and Opuntia respond instantly when touched by the body to any insect. The extent of the seismonastic movement depends upon such factors as the intensity of the stimulus, the vigour and age of the plant, and the time elapsed since the last stimulus.

Type # 2. Photonastic Movements:

These movements are induced by fluctuations in the intensity of light Such movements are exhibited by flowers of several plants. Many flowers open with the increasing illumination of the day and close up with the decrease in light intensity. Flowers of Cestrum nocturnum open at night, and close up with the dawn of the day.

Answer 2

In Mimosa pudica, when we touch the leaves of Mimosa pudica it fall and enclose.

Here, our touch is stimuls for the nastic movement.

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Hope it helps.

#Amrit⭐