Define a reflex arc. Why have reflex arcs evolved in animals ? Trace the sequence of events which occur, when you suddenly touch a hot object.

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TextNervous System in AnimalsReflex Action and Reflex ArcCoordination in Human Body Through Nervous SystemTropic Movements in PlantsGeotropism 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.

CASE_STUDIESCoordination in Human Body Through Nervous SystemTropic Movements in PlantsNastic Movements in Plants

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