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Under normal circumstances in the absence of stimulus, the cells located at the multicellular swelling called pulvini(singular, pulvinus) of the makahiya plant are filled with water, a condition referred to as turgidity. Upon exposure to outside stimulus such as touch, wind, heat or intense light, an electrical signal is generated. This electrical signal is converted into a chemical signal causing the potassium ions and water molecules to diffuse out of the cells of the pulvini into the intracellular spaces. Consequently, turgor pressure is lost inside the cells resulting in the collapse of these cells. In effect, the makahiya plant responds by closing its leaflets.

Source: Exploring Life Through Science: Biology (John Donnie A. Ramos and Anna Cherylle Morales-Ramos with coordinator Gloria de Castro-Bernas, Ph.D., Copyright 2006, page 231)

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-aleili nadezhda garcia

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Because mimosa is so shy and its bail

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Q: Why does makahiya closes when touching?
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