How is brain and spinal-cord protected against mechanical injuries ?

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TextHuman Brain and Its PartsCoordination in Human Body Through Nervous SystemNastic Movements in PlantsPlant Hormones and Their FunctionsCBSE PYQ

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The plant hormone whose concentration stimulates the cells to grow longer on the side of the shoot which is away from light is :

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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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