Question

Two bottles were half-filled with water from Ganga (‘P’) and Kaveri (‘Q’) and kept under identical airtight conditions for 5 days. The oxygen was determined to be 2% in bottle (‘P’) and 10% in bottle (‘Q’). What could be the cause of this difference?

(a) Ganga is more polluted than Kaveri

(b) Both the rivers are equally polluted

(c) Kaveri is more polluted than Ganga

(d) Kaveri has more minerals than Ganga

Answer 1

(a) Ganga is more polluted than Kaveri

Ganga is more polluted than Kaveri → lower DO [Dissolved Oxygen] indicates polluted water

Dissolved oxygen refers to the level of free oxygen present in water levels that are too high or too low can harm aquatic life and affect water quality.