Question 15
We should not allow mosquitoes to breed in our surroundings because they

(a) multiply very fast and cause pollution
(b) are vectors for many diseases
(c) bite and cause skin diseases
(d) are not important insects

(b) are vectors for many diseases

We should not allow mosquitoes to breed in our surroundings because they are the vectors for many diseases.

They are agents for diseases like Malaria, Brain fever or encephalitis, Dengue etc.