Question

Why do we need to change water frequently in an aquarium?

• A. For the supply of oxygen
• B. For the supply of food
• C. For the supply of carbon dioxide
• D. None of these

Answer 1

The correct option is A

For the supply of oxygen

By changing water we are maintaining the continuous supply of dissolved oxygen which is needed by the fish for respiration. Respiration is a process in living organisms involving the production of energy, typically with the intake of oxygen and the release of carbon dioxide from the oxidation of complex organic substances.