Which one of the following are analogous structures

Options

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

Explanation

To determine which of the following are analogous structures, we first need to understand what analogous structures are. Analogous structures are organs that perform similar functions but have different evolutionary origins.

Let's analyze each option step by step:

1. **Flippers of Dolphin and Legs of Horse**:
- The flippers of a dolphin are adapted for swimming, while the legs of a horse are adapted for running. Although both structures serve the function of locomotion, they have different evolutionary origins (dolphins are mammals adapted to aquatic life, and horses are terrestrial mammals). Therefore, they are not analogous; they are homologous structures.

2. **Wings of Bat and Wings of Pigeon**:
- Both the wings of bats and the wings of pigeons serve the function of flight. However, they have different origins: the wings of bats are modified forelimbs with skin membranes, while the wings of pigeons are modified forelimbs with feathers. Since they perform the same function but have different evolutionary origins, they are considered analogous structures.

3. **Gills of Prawn and Lungs of Man**:
- Gills in prawns and lungs in humans both serve the function of respiration. However, they are derived from different evolutionary paths (gills are for aquatic respiration in crustaceans, while lungs are for terrestrial respiration in mammals). Thus, they are homologous structures, not analogous.

4. **Thorns of Bougainvillea and Tendrils of Cucumber**:
- Thorns and tendrils serve different functions (protection vs. support) and have different origins. They are not analogous structures.

Based on this analysis, the correct answer is:

**Wings of Bat and Wings of Pigeon** are the analogous structures.