Q5 of 76 Page 258

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

The two factors which can be used to find whether the river water has been contaminated are:

i) The presence of coliform bacteria in rainwater.- Coliform is a harmless bacteria found in human intestine. However, if coliform is present in water it is a sign that the water may contain other harmful bacteria.


(ii) Measurement of pH of rainwater.- pH level below 7 indicates high levels of acid and hence confirms the contamination of water.


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3

Apart from the availability of forest products, name two other things which are affected by the destruction of forests.

 4

Name the rivers with which the following dams are associated:

(a) Tehri Dam


(b) Sardar Sarovar Dam


(c) Bhakra Dam

 6

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

 7

With which process are the following ancient structures associated?

Kulhs, Eris, Surangams, Kattas, Pynes