Female Anopheles can be distinguished from female Culex because it sits

Options

A. at right angles to surface of substratum
B. parallel to surface of substratum
C. at an angle with substratum
D. None of the above

Answer

To distinguish between female Anopheles and female Culex mosquitoes, we can follow these steps:

1. **Identify the Organisms**: Understand that we are comparing two types of mosquitoes: Anopheles and Culex. Both are important in the study of vectors for diseases.

2. **Understand the Context**: Female Anopheles mosquitoes are known to be vectors for malaria, while female Culex mosquitoes are vectors for other diseases, such as West Nile virus.

3. **Observe the Sitting Posture**: The key difference between these two types of mosquitoes lies in their sitting posture.

4. **Describe the Sitting Angle**: Female Anopheles mosquitoes sit at an angle to the surface (substratum) they are resting on. This means that their body is not parallel to the surface but rather inclined.

5. **Contrast with Culex**: In contrast, female Culex mosquitoes tend to sit more horizontally or parallel to the substratum.

6. **Conclusion**: Therefore, the distinguishing feature is that female Anopheles mosquitoes sit at an angle with the substratum, while female Culex mosquitoes do not.

Based on this analysis, the correct answer to the question is that female Anopheles can be distinguished from female Culex because it sits at an angle with the substratum.