What happens when the leaves of the touch-me-not (Mimosa) plant are touched?
They fold up and droop
The touch-me-not plant, scientifically known as Mimosa pudica, shows a rapid movement response to touch, which is a form of a nastic movement.
When its leaves are touched, a rapid change occurs in the water pressure inside specialised cells at the base of the leaflets, called pulvini, causing a loss of turgidity there.
This sudden loss of turgor pressure makes the leaflets fold inward and the leaf droop almost immediately, a response that likely helps protect the plant from herbivores.
Hence, the correct answer is that the leaves fold up and droop.
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