How is the movement of leaves of a sensitive plant different from the downward movement of the roots ?

Geotropism in Plants, Nastic Movements in Plants | PadhAiPro

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TextGeotropism in PlantsNastic Movements in PlantsCBSE PYQ

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Plants have neither a nervous system nor muscles, even then they respond to stimuli. For example, the leaves of chhui-mui (touch-me-not) plant when touched begin to fold up and droop.

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Leaves of chhui-mui plant begin to fold up and droop in response to a stimulus. Name the stimulus and write the cause for such a rapid movement. Is there any growth involved in the movement ?

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