Which one of the following groups are not analogous organs

Options

A. Wings of birds and wings of butterfly
B. Eye of Octopus and eye of mammals
C. Flippers of penguins and flippers of Dolphin
D. Thorns of Bongainvillea and tendril of Cucurbita

Answer

To determine which group of organs is not analogous, we need to understand the definitions of analogous and homologous organs.

### Step-by-Step Solution:

1. **Understand Analogous Organs**:
- Analogous organs are those that perform similar functions but have different evolutionary origins. This means they do not share a common ancestor but have evolved similar traits due to similar environmental pressures. An example is the wings of birds and the wings of insects.

2. **Understand Homologous Organs**:
- Homologous organs, on the other hand, have a common evolutionary origin but may serve different functions. An example is the forelimbs of mammals, which may serve different purposes (like swimming in dolphins and grasping in humans) but share a common structural origin.

3. **Analyze the Options**:
- **Option A**: Wings of birds and wings of butterflies.
- These are analogous organs because they serve the same function (flying) but have different origins.

- **Option B**: Eye of octopus and eye of mammals.
- These are also analogous organs because they serve the same function (vision) but evolved independently.

- **Option C**: Flippers of penguins and flippers of dolphins.
- These are analogous organs as well, serving the same function (swimming) but originating from different ancestors.

- **Option D**: Thorns of Bougainvillea and tendrils of Cucurbita.
- These are not analogous organs. They have the same origin (both are modified axillary branches) but serve different functions (thorns for protection and tendrils for climbing).

4. **Conclusion**:
- The correct answer is **Option D** (Thorns of Bougainvillea and Tendril of Cucurbita) as they are homologous organs, not analogous.

### Final Answer:
**Option D: Thorns of Bougainvillea and Tendril of Cucurbita are not analogous organs.**

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