On what basis are the human arm and bat wing considered homologous?
Answer and explanation
Correct answer: Similarity in the basic bone plan
Homology is identified mainly by a shared underlying structural plan and origin, not by identical use. The human arm is adapted for grasping and manipulation, whereas the bat wing supports flight, yet both contain corresponding bones such as the humerus, radius, ulna, and hand bones. Therefore option A is correct. B is wrong because their functions differ; C is wrong because their outer shapes differ, and D is factually false.
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What is the correct answer to this question?
Similarity in the basic bone plan
Why is this the correct answer?
Homology is identified mainly by a shared underlying structural plan and origin, not by identical use. The human arm is adapted for grasping and manipulation, whereas the bat wing supports flight, yet both contain corresponding bones such as the humerus, radius, ulna, and hand bones. Therefore option A is correct. B is wrong because their functions differ; C is wrong because their outer shapes differ, and D is factually false.
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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