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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.
How is the movement of leaves of a sensitive plant different from the downward movement of the roots ?
Write the significance of peripheral nervous system in human beings.
How is human brain protected from mechanical injuries and shocks ?
Name one directional growth movement each in response to chemicals and water in plants. Write an example for each of them.
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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