Q9 of 19 Page 144

We should manage the waste water in order to prevent water pollution and its harmful effects.

i) What are the ways by which water gets contaminated?


ii) How will you control water contamination in your house?

i) Water gets polluted/ contaminated in following ways:

● By discharges from industries, households etc.


● By movement of rain water over land which picks up fertilizers, insecticides and carries them into the river, lakes etc.


● People wash their clothes on the bank of rivers which pollutes them.


● By dumping garbage into rivers


● By dumping statues of deities in water bodies.


ii) Water contamination in our houses can be controlled in following ways:


● By using toilets which are connected to septic tanks. Septic tanks are underground tanks where sewage is collected and then drained later on.


● By preventing the stagnation of water around our houses.


● By not using herbicides, insecticides in our gardens.


● By using biodegradable detergents instead of synthetic ones.


● By not disposing the waste material from our houses to nearby water bodies.


More from this chapter

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5

Match the following:

 6

Water contaminated by human beings, chemical or industrial wastes can cause a variety of communicable diseases through ingestion or physical contact.

i) Name any two diseases caused by polluted water.


ii) Why do we drink boiled water?


iii) How can you reuse waste water in your houses?

 7

Water, a precious physical substance, is essential to all living organisms.

i) Which is the largest water resource?


ii) What are the various sources of water?


iii) Which is the primary source of water?


iv) What are the ways by which you can raise the ground water level in your house?

 8

An energy audit is an inspection, survey, and analysis of energy flow to ensure energy conservation in a building, process or system.

i) How will you measure consumption of electrical energy at home?


ii) What are the benefits of implementing this method in your school?