Organs which have similar origin and developmental plan, but different functions are called

Options

A. Vestigial organs
B. Analogous organs
C. Homologous organs
D. Physiological organs

Answer

To solve the question, we need to identify the type of organs that share a similar origin and developmental plan but have different functions. Let's break down the options provided:

1. **Vestigial Organ**: These are organs that have lost their original function through evolution. They are not what we are looking for, as they do not share a developmental plan with a different function.

2. **Analogous Organ**: These organs perform similar functions but have different origins and structures. For example, the wings of birds and insects serve the same purpose (flight) but are structurally different. This does not fit our criteria.

3. **Homologous Organ**: These organs have a similar origin and developmental plan but may serve different functions. For example, the forelimbs of humans, birds, and whales have different functions (grasping, flying, swimming) but share a common structural framework. This matches the description given in the question.

4. **Physiological Organ**: This term refers to systems in the body (like the cardiovascular system or digestive system) and does not pertain to the question regarding organ similarity in origin and function.

Based on this analysis, the correct answer is **homologous organ**.

### Step-by-Step Solution:
1. **Identify the types of organs**: Understand the definitions of vestigial, analogous, homologous, and physiological organs.
2. **Analyze the definitions**:
- Vestigial: No function.
- Analogous: Different origin, similar function.
- Homologous: Similar origin, different function.
- Physiological: Refers to body systems.
3. **Match the definitions with the question**: The question asks for organs with similar origin and developmental plan but different functions.
4. **Select the correct answer**: The only option that fits this description is homologous organs.

### Final Answer:
The organs which have similar origin and developmental plan, but different functions are called **homologous organs**.