Described in Wikipedia Mimosa pudica is a strange tropical plant : touch it and it will immediately react by folding its leaflets. Other stimuli like warming, blowing, or shaking will also affect it. " It is not known exactly why Mimosa pudica evolved this trait, but many scientists think that the plant uses its ability to shrink as a defense from predators. "or " .. the sudden movement dislodges harmful insects."
Even more amazing is that it can ... remember lessons ! Indeed Stefano Mancuso , Professor at the International laboratory of plant neurobiology has done a simple experiment : if we lift the potted plant several times in a row it will at first react by folding its leaflets, but after 5 to 6 times it won't react anymore to the game, knowing that the attack is not dangerous, contrary to the touching and other stimuli direct on its leaves. And the lesson will be remembered .. 40 days !!.
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