A) 6 pairs
B) 5 pairs
C) 3 pairs
D) 2 pairs
Correct Answer: D
Solution :
Ribs are 12 pairs, semicircular bones extended from thoracic vertebrae towards sternum. Each rib has an anterior cartilaginous sternal part and a posterior, bony vertebral part . In man upper 7 pairs ribs are attached to the sternum directly (true ribes) while 8th 9th and 10th pairs of ribs are called false ribs because they are not directly attached to sternum instead they first attached to 7th pair of ribs. And last two pairs of ribs i.e., 11th and 12thare known as floating ribs, because their sternal parts remain free.
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