What is said to get activated when the Mimosa pudica plant is touched?

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Solution

Mimosa pudica:
Mimosa pudica is also known as a touch-me-not or sensitive plant.
When it is touched, the stimulus reaches the base of the leaf/pulvinus, and the same flushes all it's liquid due to which turgor pressure is lost and cells lose the rigidity, and the leaf drops.
Therefore, it is the leaf base/pulvinus which gets activated on touching the Mimosa pudica plant.

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