Q7 of 76 Page 258

With which process are the following ancient structures associated?

Kulhs, Eris, Surangams, Kattas, Pynes

All these structures are related with rain water harvesting. Kulhs were used in Himachal Pradesh, Eris in Tamil Nadu, Surangams in Kerala, Kattas in Karnataka and Pynes in Bihar.


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5

Name two factors which can be used to find whether river water has been contaminated.

 6

Name the bacteria whose presence in water indicates the contamination with disease-causing micro-organims.

 8

Which fossil fuel is conserved :

(a) when we save on electricity?


(b) when we use bicycle for covering short distances instead of a motorbike ?

 9

What is the main purpose of rainwater harvesting ?