Question

The larva of Anopheles differs from Culex in which of the following aspects?

• A. Their head is down ward touching the bottom of lakes, rivers, etc and has respiratory trumpet.
• B. Their head is upward touching the surface of lakes, river, etc and has no respiratory trumpet.
• C. The body of larva horizontal to the surface of water and has respiratory trumpet.
• D. The body of larva making an angle to the surface of water and has no respiratory trumpet.

Answer 1

The correct option is B Their head is upward touching the surface of lakes, river, etc and has no respiratory trumpet.

The head of Anopheles is upwards and the larva rests parallel to water surface and the heads rotated 180 degrees when feeding and it lacks the siphon tube. On the other hand, Culex, has a slender air tube with several tufts and it rests at an angle to the surface and head does not rotate.
Thus, the correct answer is option B.