Select an appropriate option for the following.

Which features of water bodies alter when they are exposed to untreated liquid effluents?

i. pH   ii. Temperature   iii. Colour

The features of water bodies alter when they are exposed to untreated liquid effluents as follows:

i. pH   ii. Temperature   iii. Colour   iv. Odour

The untreated liquid effluents released from industries, hospitals, and domestic sources consist of toxic chemicals which have the potential to change the odour, colour, pH and temperature, etc. of water.

This change in pH and temperature of water bodies permits the growth of microorganisms in water thus contributing towards water pollution.