Question

Which of the following statements is/are true?

1. Water quality is relatively better in upper hilly terrains.
2. The concentration of pollutants in the rivers remain high during the summer season.
3. Organic and bacterial contaminants are the main source of pollution in the rivers.

पर्याय

• 1 and 2

• 2 and 3

• 1, 2 and 3

• 1 and 3

Answer 1

1, 2 and 3