Question

Why does a Mimosa plant close its leaves on touch?​

Answer 1

Answer:

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The mimosa pudica is a sensitive old soul, and it likely evolved its touch-me-not traits to put off herbivores.The leaves of the 'touch-me-not' fold up and droop each evening before reopening at dawn. They also do this more rapidly if they are touched or shaken. It is likely the responses evolved separately. Many plants close up at night, usually to protect pollen or reduce water loss while the leaves aren't photosynthesising.

But the Mimosa genus is a creeping shrub and highly attractive to grazing animals. It seems that at some point in its evolution a Mimosa appeared that closed up when touched. Doing so reduced the leaf area presented to herbivores and made the plant look wilted. If this was enough to make grazers look for another plant, then the genes for touch sensitivity would have spread, eventually leading to a new species.

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Answer 2

Mimosa pudica

is a creeping annual or perennial flowering plant of the pea/legume family Fabaceae and Magnoliopsida taxon, often grown for its curiosity value: the compound leaves fold inward and droop when touched or shaken, defending themselves from harm, and re-open a few minutes later.Witness Central and South America's sensitive plant's rapid movement that is thought to be a defense mechanism. The plant’s unusually quick response to touch is due to rapid water release from specialized cells located at the bases of leaflet and leaf stalks. The leaves reopen in several minutes, and it is thought that this adaptation is a defense against browsing herbivores who may be startled by the movement. In addition to its response to physical stimuli, the leaves also droop in response to darkness and reopen with daylight, a phenomenon known as nyctinastic movement.