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Mimosa pudica is a creeping annual or perennial herb known for its rapid leaf folding and drooping when touched, shaken, or exposed to heat. Native to South and Central America, it has become a pantropical weed. This report aims to dissect the biological mechanisms and evolutionary advantages behind this unique behaviour.

The most intriguing feature of the is its rapid thigmonastic response—a fancy term for movement triggered by touch. When disturbed, the leaflet pulvini (motor organs at the base of the leaves) lose turgor pressure, causing the leaves to fold inward and the stem to collapse. After a few minutes, the plant “relaxes” and returns to normal. Touch Me Not