Locomotion and Movement Question 14

14. 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]

(a) $X=12, Y=5 \quad$ True ribs are attached dorsally to vertebral column and sternum on the two ends.

(b) $X=24, Y=7 \quad$ True ribs are dorsally attached to vertebral column but are free on ventral side.

(c) $X=24, Y=12$ True ribs are dorsally attached to vertebral column but are free on ventral side.

(d) $X=12, Y=7 \quad$ True ribs are attached dorsally to vertebral column and ventrally to the sternum.

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Answer : d

Hints & Solutions

(d) In human, 12 pairs of ribs are present out of which 7 pairs of ribs (1st to 7 th pair) are dorsally attached to vertebral column and ventrally to the sternum.



NCERT Chapter Video Solution

Dual Pane