Question

Calcified cartilage is found in
A. Pubis of frog
B. Diaphysis (shaft of long bone)
C. Artificial surface of long bone
D. None of the above

Answer 1

Hint: Calcified cartilage is that cartilage in which calcium salts are deposited in the matrix and is mostly found in aging cartilage. This cartilage replaces the hyaline cartilage in older frogs and is present in the hip region of frogs.

Complete answer:
Option (A) is correct. The hip region of the frog is composed of ilium, ischium, and pubis. The pubis is made up of hyaline cartilage which is then replaced by the calcified cartilage in older frogs due to the deposition of calcium salts in the matrix.
Option (B) is incorrect. The diaphysis is the midsection or shaft of a long bone. It is made up of cortical bone and contains bone marrow and adipose tissue. In this region, primary ossification occurs.
Option (C) is incorrect. The artificial surface of long bones does not contain calcified cartilage. It is created in the laboratory that can be used in bone grafts, to replace human bone that was lost due to severe fractures, diseases, etc.
Option (D) is incorrect. Since option (A) is correct i.e., calcified cartilage is found in the pubis of frog, therefore “none of the above” option cannot be correct.

Hence, the correct answer is option (A).

Note: The hip region of the frog has three parts: ilium, ischium, and pubis. The pubis of a frog is a triangular hyaline layer initially but gets calcified that is hard and non-elastic due to the deposition of calcium salts in older frogs. In humans, the calcified cartilage is found in the ends of long bones i.e., epiphysis, and in the heads of humerus and femur bone.