Q5 of 19 Page 144

Match the following:

The above-stated diseases can be placed in the columns of respective types to which they belong:


● Water-borne disease: These are transmitted by drinking contaminated water.


● Water-related disease: Here water is not directly responsible but acts as a breeding ground for vectors which transmit disease-causing germs to us.


● Water-based diseases: These are worm infections caused due to poor personal hygiene which can be a result of lack of availability of water.


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3

Fossil fuels are formed by decomposition of biomass buried under the earth over millions of years ago.

i) Name any three fossil fuels.


ii) Which fuel is used in the production of fertilizers?


iii) What is natural gas made up of?

 4

Wind power is generated from uneven heating of the earth’s surface by the sun and the hot core.

i) Which country is called the country of winds?


ii) Which country leads the world in harnessing wind energy?


iii) In which district of Tamil nadu do we have wind energy farm?


iv) In which of the following land forms will you be able to harness maximum amount of wind energy?


(plains, canals, valleys)

 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?