Question

What happens to the bone of the frog that is kept inside HCl?
A.It will become soft and flexible
B.It will turn black
C.It will break into pieces
D.It will shrink

Answer 1

Hint: Frog belongs to the category of amphibians, their skeleton is different from that of humans but a lot of their bones match to a human being. Decalcification is the process by which calcium ions get dissolved and bones become soft.

Complete answer:
As we know the frog is a member of the amphibian group and its scientific name is Anura. Frogs can live on both land and water. Certain tree frogs have long, flexible toes that allow them to grasp stems and branches as they climb around. While in aquatic frogs there is the presence of long toes - the spaces between toes are webbed so they can use their feet like flippers. Frogs have bulging and big eyes. Remember that frog has 159 bones inside its body. Even though the frog is smaller in size and has a different number of bones as compared to humans. There are lots of bones that are found in the frog that are similar to human-like femur, ulna, tibia, etc.

As we now know the frog has similarities with the human skeleton.
It is an important part of our study and that is why dissection of a frog is an integrated part of our syllabus.
Forelimbs of frogs consist of called proximal humerus and distal ulna.
A hand is composed of carpal metacarpal just like a human does.
Frogs are smaller in size that is why it’s easy to handle them during dissection.
The main component of the bones of a frog is collagen that is a combination of amino acid.
If bones of frogs are kept in HCl for a long time these compounds are broken down that makes bones flexible.

Hence, the correct answer is option (A)

Note: Bone of frog will become flexible and soft when kept in HCl, as the bones are made of calcium ions that get dissolved and bones become soft. Frogs have bulging and big eyes. The frog has 159 bones inside its body. Even though the frog is smaller in size and has a different number of bones as compared to humans. There are lots of bones that are found in the frog that are similar to human-like femur, ulna, tibia, etc.