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Structural Organisation in Animals
Digestion and Absorption
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  1. 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. X = 12, Y = 5 True ribs are attached dorsally to vertebral column and sternum on the two ends.
    2. X = 24, Y = 7 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.
Correct Option: D

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


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