We should not allow mosquitoes to breed in our surroundings because they
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → Are vectors for many diseases
Option (1) Multiply very fast and cause pollution — Incorrect. Mosquitoes do multiply fast in stagnant water. But they do not pollute the air, water or soil. That is not why their breeding is stopped.
Option (2) Are vectors for many diseases — Correct. A vector is an organism that carries a pathogen from one person to another. The female Anopheles mosquito spreads malaria, Culex spreads filariasis, and Aedes spreads dengue and chikungunya. So the best control is to remove their breeding places, such as stagnant water and uncleaned coolers.
Option (3) Bite and cause skin diseases — Incorrect. A mosquito bite causes only a small itch. Skin diseases such as ringworm are caused by fungi, not by mosquitoes.
Option (4) Are not important insects — Incorrect. Whether an insect is important or not is no reason to stop it breeding. The danger lies in the diseases it spreads.