Thank you for reporting, we will resolve it shortly
Q.
$11^{th}$ and $12^{th}$ pair of ribs which are imperfectly formed and do not reach the sternum are called
Locomotion and Movement
Solution:
The last two pairs of ribs ($11^{th}$ and $12^{th}$) are called floating ribs as their anterior ends are not attached to either the sternum or the cartilage of another rib. The floating ribs provide protection to kidneys.