Q6 of 76 Page 258

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

Presence of coliform bacteria in water confirms the contamination of water. It is found in human intestine. Although it is harmless, it indicates the presence of other harmful bacteria.


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4

Name the rivers with which the following dams are associated:

(a) Tehri Dam


(b) Sardar Sarovar Dam


(c) Bhakra Dam

 5

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

 7

With which process are the following ancient structures associated?

Kulhs, Eris, Surangams, Kattas, Pynes

 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 ?