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Solution


Q.

Out of ‘X’ pairs of ribs in humans only ‘Y’ pairs are true ribs. Select the option that correctly represents values of X and Y and provides their explanation.       [2017]
1 X = 12, Y = 5  True ribs are attached dorsally to vertebral column and sternum on the two ends  
2 X = 24, Y = 2  The true ribs are dorsally attached to vertebral column but are free on ventral side  
3 X = 24, Y = 12  True ribs are dorsally attached to vertebral column but are free on ventral side  
4 X = 12, Y = 7  True ribs are attached dorsally to vertebral column and ventrally to the sternum  

Ans.

(4)