A) endoderm
B) ectoderm
C) mesoderm
D) corneous layer
Correct Answer: A
Solution :
The wall of the eye ball of frog is made up of three concentric layers : sclerotic, choroid and retina. Sclerotic is an outer, thick, protective coat. It is made up of tough fibrous connective tissue and cartilage. In frog the sclerotic layer is formed from endoderm.
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