Question

The homologous organs are those that show similarity in

• A. appearance
• B. function
• C. origin
• D. size.

Answer 1

The Correct Option is C

The question revolves around understanding the concept of homologous organs in biology. Let's break down the answer step-by-step.

Understanding Homologous Organs:

Homologous organs are anatomical structures found in different species that share a common ancestry. They are inherited from a common ancestor and have the same basic structure, but may perform different functions.

1. Similarity in Origin: Homologous organs originate from the same ancestor, indicating a shared evolutionary history. This similarity is in their embryonic development and underlying genetic structures.
2. Differences in Function: Although homologous organs share a common origin, they may have evolved to perform different functions. For example, the forelimbs of humans, wings of birds, and flippers of whales all originate from a common ancestor but serve different purposes.
3. Interpretation of Options:
   • Appearance: Homologous organs may look different due to adaptation to different environments.
   • Function: As mentioned, functions can vary considerably.
   • Origin: This is the correct answer as it highlights the shared ancestry of these organs.
   • Size: Size does not determine homology; organs can vary in size due to different adaptive requirements.

Conclusion: Homologous organs are primarily similar due to their origin. They indicate evolutionary relationships among species. Therefore, the correct answer is origin.