Question

What can you infer about the structures shown in figure?

• A. They are homologous structures
• B. They are vestigial structrues
• C. They are analogous structures
• D. They have nothing to do with each other

Answer 1

Answer: (A)

They are homologous structures

Given figures represent the forelimbs of different vertebrates, which possess the same basic structural plane, i.e., in each case, the forelimb consists of humerus, radio-ulna, carpals, metacarpals and digits. Thus, the skeletal parts of these forelimbs are similar in structure and arrangement but have different shapes and functions. It depicts the example of homologous structures.

So, the correct answer is 'They are homologous structures'.