There is a special organ called "leaf pillow" at the base of the petiole of Mimosa. There are many parenchyma cells growing in the leaf pillow. These parenchyma cells and their sensitivity will react when they are slightly shocked or stimulated by the outside world.
When the leaves are touched and vibrated, the cell fluid in the parenchyma cells will gradually flow to the cell gap, which greatly reduces the cell expansion, reduces the pressure of the parenchyma cells at the end of the occipital, and forms the phenomenon that the leaves are tightly closed and the petioles are drooping.
With the continuous growth of Mimosa, the leaves will also grow and close, especially in the silent night, Mimosa leaves close, petioles gradually droop.
During the day, when it is shaken by external forces, it will also close. When the light intensity of Mimosa is relatively weak, the water supporting the leaves in the pillow will flow to the two sides, resulting in the closure of the leaves. This phenomenon will last for less than two minutes. When the cell fluid returns to the pillow, the leaves will gradually return to their original state.
In addition, the leaves of Mimosa will shrink rapidly before receiving severe vibration, and then wither suddenly. With this feature, we can use Mimosa to predict earthquakes. Xiaobian has explained the contraction of Mimosa. Do you know anything about it?
