Which one of the following are analogous structures?

Options

A. Wings of Bat and Wings of Pigeon
B. Gills of Prawn and Lungs of Man
C. Thorns of Bougainvilea and Tendrils of Cucurbita
D. Flippers of Dolphin and Legs of Horse

Answer

To determine which structures are analogous, we need to understand the definitions and differences between analogous and homologous structures.

### Step-by-Step Solution:

1. **Understand Analogous Structures**:
- Analogous structures are those that have different anatomical structures and origins but perform similar functions. They arise due to convergent evolution, where different species adapt to similar environments or ecological niches.

2. **Understand Homologous Structures**:
- Homologous structures have a similar anatomical structure and origin but may serve different functions. They arise from a common ancestor and reflect evolutionary relationships.

3. **Analyze the Given Options**:
- The question provides four options. We need to evaluate each pair of structures to identify which ones are analogous.

4. **Evaluate Each Option**:
- **Option 1**: Wings of bat and wings of pigeon.
- Both are modifications of forelimbs and have the same origin. **(Homologous)**
- **Option 2**: Gills of prawn and lungs of man.
- Both serve the function of respiration but evolved from different structures. However, they share a common ancestor. **(Homologous)**
- **Option 3**: Thorn of Bougainvillea and tendrils of Cucurbita.
- Both are modifications of axillary buds and have the same origin. **(Homologous)**
- **Option 4**: Flippers of dolphin and legs of horse.
- Flippers are modified forelimbs (with a different structure) and legs are hind limbs. They serve similar functions in locomotion but have different anatomical structures and origins. **(Analogous)**

5. **Conclusion**:
- The only pair that qualifies as analogous structures is the **flippers of dolphin and legs of horse**.

### Final Answer:
**The flippers of dolphin and legs of horse are analogous structures.**

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