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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.
Sense organ in which olfactory receptors are present is :
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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