Q13 of 27 Page 94

How are open drains harmful for human health?

Open drains are harmful for human health as :

i) It is the breeding ground for flies, mosquitoes and many other disease-causing germs.


ii) It creates air pollution by its foul smell.


iii) During the rainy season these drains overflow and pollute the surroundings especially the water bodies and causes many water-borne diseases like diarrhoea, cholera etc.


More from this chapter

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11

Why are open drains a concern?

 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.

 14

Name two inorganic impurities present in sewage.

 15

Animal waste, oil and urea are some of the organic impurities present in sewage. Name two more organic impurities present in sewage.