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NCERT VI Social Sciences

Answer the following:

(a) What is a ball and socket joint?
(b) Which of the skull bones are movable?
(c) Why can our elbow not move backwards?


A.   a    ball  and socket joint  is a  moveable  joint .  ex:   shoulder..
B.     only with the  help of   lower jaw  in skull  bones in movable.
C.     HINGE JOINTS WHICH  ARE  ALLOWS   movement  back and front . so, we cannot   move  our elbow backword...
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A ball and socket joint are the movable joints
(b)the lower part of the skull i.e.,(chin) only movable
(c) with the help of hinge joint we are able to move oue hand up and down but not backward
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