Question

The roof of the cranium of frog is formed by

(a) frontoparietal

(b) orbitosphenoid

(c) parasphenoid

(d) alisphenoid.

Answer 1

The answer is (a) frontoparietal and (c) parasphenoid

Explaination:

1] The part of the skull which encloses and protects the brain is called cranium i.e. brain box.

2] The cranium is formed of six bones which are named as pairs of frontoparietal bones and exoccipital bones, a sphenethomoid and a parasphenoid bones.

3] Dorsally the cranium is formed by frontoparietals whereas ventrally, it is formed by parasphenoid bone. And laterally, it is formed by sphenethmoid bone.