Biology · PYQ NEET UG 2017

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.

1. A
   X = 12, Y = 7 True ribs are attached dorsally to vertebral column and ventrally to the sternum.
2. B
   X = 12, Y = 5 True ribs are attached dorsally to vertebral column and sternum on the two ends.
3. C
   X = 24, Y = 12 True ribs are dorsally attached to vertebral column but are free on ventral side.
4. D
   X = 24, Y = 2 True ribs are dorsally attached to vertebral column but are free on ventral side.