Question

Which of the following factors help in confirming the contamination of river water?

i. Measurement of pH of river water

ii. Presence of chlorine in river water

iii. Existence of diverse life forms in river water

iv. Presence of coliform bacteria in river water

Choose the correct option from the following. 

Options

• (i) and (iv)

• (ii) and (iii)

• (iii) and (iv)

• (ii) and (iv)

Answer 1

(i) and (iv)

Explanation: 

The pH of water and coliform presence in water indicates contamination by disease-causing microorganisms.