Which one of the following sets includes all homologous organs

Options

A. (a) hindlegs of dog, duck and kangaroo
B. (b) wings of bats, butterlies and birds
C. (c) sting of honeybee,scorpion and mosquito
D. (d) tail of rat, peacock and earthworm

Answer

**Step-by-Step Solution:**

1. **Understand the Concept of Homologous Organs:**
- Homologous organs are those that have a similar structure due to a common evolutionary origin but may serve different functions in different species. This indicates divergent evolution.

2. **Identify Characteristics of Homologous Organs:**
- They arise from a common ancestor.
- They exhibit structural similarity.
- They perform different functions.

3. **Analyze the Given Options:**
- **Option A:** Hind limbs of dog, duck, and kangaroo.
- All three species have a common ancestor and their hind limbs show structural similarities but serve different functions (walking/running for dog, jumping for kangaroo, swimming for duck).
- **Option B:** Wings of bats, butterflies, and birds.
- These belong to different evolutionary lineages (mammals, arthropods, and birds) and are not homologous; they are analogous organs.
- **Option C:** Stings of honey bees, scorpions, and mosquitoes.
- These are also analogous organs, not homologous, as they do not share a common evolutionary origin.
- **Option D:** Tail of rat, peacock, and earthworm.
- These tails do not share a common structure or origin, making this option incorrect.

4. **Conclusion:**
- The only option that includes all homologous organs is **Option A: Hind limbs of dog, duck, and kangaroo**.

**Final Answer:**
- The correct answer is **Option A: Hind limbs of dog, duck, and kangaroo**.

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