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Discuss the immediate changes in response to stimuli

Discuss the immediate changes in response to stimuli
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Immediate response to stimulus is independent of growth. Plants use electrical-chemical means to convey information, but it has no specialized tissue. Movement is done by changing shape. It is done by changing the amount of water. Like in case of mimosa (Touch-me-not Plant) which take weak response of touch.

Mimosa pudica is called as touch-me-not plant. It wilts as a response to touch or a similar stimulus.

The leaves wilts as a result of the internal movement of water. A stimulus, such as a touch, triggers certain areas of the stem to release chemicals, which cause water to move from cell vacuoles to intercellular space which leads to cell shrink.

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