Why is it risky to call two externally similar organs homologous based only on outer appearance?
Answer and explanation
Correct answer: Because similar functions can produce external similarity even when the basic structures differ
The governing concept is the distinction between homologous and analogous organs. Homologous organs share a basic structural plan because of common ancestry, even if their functions differ. Analogous organs may look or function similarly because similar environmental demands shaped them, although their internal designs and origins differ. Therefore outer appearance alone is insufficient, making option A correct. Options B, C, and D ignore the importance of structure and ancestry.
Frequently asked questions
What is the correct answer to this question?
Because similar functions can produce external similarity even when the basic structures differ
Why is this the correct answer?
The governing concept is the distinction between homologous and analogous organs. Homologous organs share a basic structural plan because of common ancestry, even if their functions differ. Analogous organs may look or function similarly because similar environmental demands shaped them, although their internal designs and origins differ. Therefore outer appearance alone is insufficient, making option A correct. Options B, C, and D ignore the importance of structure and ancestry.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: World of Living. Topic: Heredity and Evolution.
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