Vestigial wings occur in

Options

A. Housefly
B. Mosquito
C. Blatta
D. Periplaneta.

Answer

To determine where vestigial wings occur among the given options, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Concept of Vestigial Wings**: Vestigial wings are remnants of wings that have lost their original function over time. They are often reduced in size and are not used for flight.

2. **Analyze the Given Options**: The options provided are:
- Housefly
- Mosquito
- Blatta (Oriental Cockroach)
- Periplaneta (American Cockroach)

3. **Research Each Option**:
- **Housefly**: Houseflies have fully developed wings and are capable of flight.
- **Mosquito**: Mosquitoes also have fully developed wings and can fly.
- **Blatta (Oriental Cockroach)**: The male cockroach has fully developed wings, but the female cockroach has vestigial wings.
- **Periplaneta (American Cockroach)**: Both male and female American cockroaches have fully developed wings.

4. **Identify the Correct Answer**: Based on the analysis, the only option where vestigial wings occur is in the female Blatta (Oriental Cockroach).

5. **Conclusion**: Therefore, the correct answer is Blatta (Oriental Cockroach).

### Final Answer:
Vestigial wings occur in **Blatta (Oriental Cockroach)**.

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