Question

Which of the subsequent doesn't have corresponding bones?
(A) Pelvic and pectoral girdles
(B) Atlas and coccyx
(C) Carpals and tarsals
(D) Humerus and femur

Answer 1

There are a total of $206$ to $213$ bones in an adult human out of which few are the corresponding bones. The corresponding bones have their parts which are similar generally, their structure has been adapted to differing functions. From the given above options attempt to find out which of the bones within the above given pitons are similar generally but their structure has been adapted for performing different functions within the body.

Complete answer:
Option A Pelvic and pectoral girdles. The pelvis is formed from three bones called ilium, ischium and pubis while the girdle is formed from clavicle and scapula bone. These don't have the corresponding bones.
So, option A is correct.
Option B Atlas and coccyx: Atlas is the first cervical vertebrae and therefore the coccyx is the last caudal vertebrae. they're corresponding bones.
So, option B isn't correct.
Option C Carpals and tarsals: Carpals are short bones that structure the wrist of hand and therefore the tarsals are the short bones that form the ankle of foot. They correspond to bones.
So, option C isn't correct.
Option D Humerus and femur: The humerus and femur are corresponding bones of the arms and legs, respectively. While their parts are similar generally, their structure has been adapted to differing functions.
So, option D isn't correct.

So, option A is the correct answer.

Note:
The atlas bone is the first of seven cervical vertebrae (vertebra cervicalis I or $C1$). It supports the load of the skull. The name of this bone was derived from a deity of Greek mythology called Atlas, who supported the heavens. Femur is the only bone in the thigh and it is one of the longest, heaviest and strongest bones in the human body. So, it is a well-preserved bone in nature from the human skeleton.