An open-drain system is a breeding place for which of the following. (a) Flies (b) Mosquitoes (c) Organisms which cause diseases (d) All of these

Soln:

The answer is (d) All of these

Explanation:

The opening draining system causes problems with the foul smell. The open drainage system is the breeding sources for mosquitos and flies. The open drainage system also helps the growth of disease-causing organisms.