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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.
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.
Name the part of nervous system which helps in communication between the central nervous system and other parts of the body. What are the two components of this system ?
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