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Q.

Last two (11th and 12th) pairs of ribs are different from all other ribs because 

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a

dorsally they are attached to the thoracic vertebrae

b

intercostal muscles are not attached to them

c

they join the tenth rib with the help of hyaline cartilage

d

ventrally they are attached neither to the sternum nor to the cartilages of other ribs

answer is D.

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Detailed Solution

The last two pairs of ribs are called floating ribs (vertebral ribs). They are dorsally attached to the thoracic vertebrae but are ventrally free.

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