Why can it be risky to decide evolutionary relationship only by external appearance?
Answer and explanation
Correct answer: Because similar functions can produce external similarity even when basic structures differ
External appearance can be misleading because unrelated organisms may face similar environmental demands and evolve similar shapes or functions. These are analogous similarities and do not necessarily indicate close ancestry. For example, wings of birds and insects both support flight but have different structural plans. Evolutionary relationships should therefore be assessed with internal anatomy, fossils, embryology and molecular evidence as well. Option A is correct; the other choices make absolute or false claims.
Frequently asked questions
What is the correct answer to this question?
Because similar functions can produce external similarity even when basic structures differ
Why is this the correct answer?
External appearance can be misleading because unrelated organisms may face similar environmental demands and evolve similar shapes or functions. These are analogous similarities and do not necessarily indicate close ancestry. For example, wings of birds and insects both support flight but have different structural plans. Evolutionary relationships should therefore be assessed with internal anatomy, fossils, embryology and molecular evidence as well. Option A is correct; the other choices make absolute or false claims.
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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