Q11 of 27 Page 94

Why are open drains a concern?

Open drains are a concern as it is the breeding ground for mosquitoes and many other germs. It pollutes our environment with a foul smell and spread diseases.


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In a filtration, plant water is filtered using layers of

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Which of the following is not a source of waste water?

 12

State whether the following statements are True or False. In case a statement is false, write the correct statement.

(a) Sewage is a solid waste which causes water pollution and soil pollution.


(b) Used water is wastewater.


(c) Wastewater could be reused.


(d) Where underground sewerage systems and refuse disposal systems are not available, the high-cost on-site sanitation system can be adopted.

 13

How are open drains harmful for human health?