Wings of birds and forelimbs of horse are ________ organs

Options

A. Vestigal
B. Analogous
C. Homologous
D. None of the above.

Answer

To answer the question "Wings of birds and forelimbs of horse are ________ organs," we need to analyze the types of organs based on their origin and function.

### Step-by-Step Solution:

1. **Understanding the Types of Organs**:
- **Vestigial Organs**: These are non-functional organs that were once functional in ancestors. For example, human appendix is a vestigial organ.
- **Analogous Organs**: These organs have different evolutionary origins but perform similar functions. An example is the wings of insects and birds; both are used for flying but evolved independently.
- **Homologous Organs**: These organs have a common evolutionary origin but may serve different functions. For instance, the forelimbs of mammals (like humans, whales, and horses) have similar bone structures but may be adapted for different functions (grasping, swimming, running).

2. **Analyzing the Given Organs**:
- **Wings of Birds**: These are adapted for flying.
- **Forelimbs of Horses**: These are adapted for running and support.

3. **Comparing the Two**:
- Both the wings of birds and the forelimbs of horses originated from a common ancestral structure, which means they share a similar evolutionary origin.
- However, their functions are different: one is for flying (wings) and the other is for running (forelimbs).

4. **Conclusion**:
- Since the wings of birds and the forelimbs of horses have the same origin but different functions, they are classified as **homologous organs**.

Thus, the answer is: **Wings of birds and forelimbs of horse are homologous organs.**