Question

The number of floating ribs in the human body is
A. Six pairs
B. Three pairs
C. Five pairs
D. Two pairs

Answer 1

Hint: One can say that movement is one of the essential features of living creatures. Movement of cilia, flagella, tentacles are shown by many organisms—unicellular organisms like the amoeba exhibit a simple form of activity. Animals and plants exhibit their kinds of movements, and it is in a wide range. Humans show movement by limbs, jaws, eyelids, tongue, etc. Some of the movements change the place or location. Such movements are called locomotion. Walking, running, climbing, flying, swimming is all some form of locomotor movements.

Complete answer:
Two pairs: In the thorax's ventral midline, there is a flat bone called the sternum. There are 24 ribs. Each rib is a thin flat bone connected ventrally to the sternum and dorsally to the vertebral column.
1st 14 ribs are called "true ribs." Ventrally connected to the sternum with the support of hyaline cartilage. Dorsally they are fit to the thoracic vertebrae. The 8th, 9th, 10th pairs of ribs are not articulated directly to the sternum but go with the 7th rib with hyaline cartilage support.
These are called vertebrochondral ribs or false ribs. The last four ribs are not connected ventrally; therefore, they are called floating ribs. Ribs, sternum, and thoracic vertebrae form a ribcage.
Six pairs: 6 pairs of floating ribs are not present in humans.
Three pairs: 3 pairs of floating ribs are not present in humans.
Five pairs: 5 pairs of floating ribs are not present in humans.
So, the correct answer is “Option D”.

Note:
The term floating ribs indicates one of the last two ribs. We can define the word floating rib as the rib, which is not attached to the sternum. They are not connected to other ribs. The term true ribs indicate the first seven ribs are connected to the sternum in the front. The term false ribs show the ribs below the five ribs and do not directly attach to the sternum.