NCERT Exemplar Solutions Class 7 Science Solutions for Wastewater Story - Exercise in Chapter 18 - Wastewater Story

Question 15 Wastewater Story - Exercise

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


The answer is (d) All of these


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.

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