Periplaneta americana and Blatta orientalis differ mainly from each other in

Options

A. Body size
B. Wing length
C. Length of antenna
D. Life history

Answer

To answer the question regarding how Periplaneta americana and Blatta orientalis differ from each other, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Species**:
- Periplaneta americana is commonly known as the American cockroach.
- Blatta orientalis is known as the Oriental cockroach.

2. **Compare Body Size**:
- Both species generally have a similar body size and form. Therefore, body size is not a distinguishing factor.

3. **Examine Wing Length**:
- Periplaneta americana has large and prominent wings, which allow it to fly effectively.
- Blatta orientalis, on the other hand, has small and vestigial wings, which significantly limit its ability to fly.

4. **Assess Antenna Length**:
- The length of the antennae in both species is similar. Thus, antenna length does not serve as a distinguishing characteristic.

5. **Evaluate Life History**:
- The life cycles of both species are similar, indicating that life history is not a differentiating factor.

6. **Conclusion**:
- The primary difference between Periplaneta americana and Blatta orientalis lies in their wing length. Therefore, the correct answer is that they differ mainly in wing length.

### Final Answer:
Periplaneta americana and Blatta orientalis differ mainly in their wing length.