When homologous organs are taken as evidence of common ancestry, what is considered more important than outer shape?
Answer and explanation
Correct answer: Their basic structure and developmental plan
Homologous organs can perform different functions and may look quite different externally, yet they retain similarities in their underlying structural arrangement and developmental plan. These similarities are interpreted as evidence inherited from a common ancestor, with later modification for different uses. Therefore A is correct. Colour, size, and habitat alone do not establish homology, so B, C, and D are inadequate.
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What is the correct answer to this question?
Their basic structure and developmental plan
Why is this the correct answer?
Homologous organs can perform different functions and may look quite different externally, yet they retain similarities in their underlying structural arrangement and developmental plan. These similarities are interpreted as evidence inherited from a common ancestor, with later modification for different uses. Therefore A is correct. Colour, size, and habitat alone do not establish homology, so B, C, and D are inadequate.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: The Human Eye and the Colourful World. Topic: Atmospheric refraction.
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