Question

<!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> The rate of breathing in fishes is higher than the organisms living on land. Can you identify the reason?

• A. The amount of oxygen in air and water is same.
• B. Fishes require more oxygen.
• C. There is more oxygen in water than in air.
• D. There is more oxygen in air than in water.

Answer 1

The correct option is D There is more oxygen in air than in water.

<!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> The breathing rate of fishes is faster than that of terrestrial animals because the amount of dissolved oxygen in the water is much less than the amount in air, so they have to breathe faster in order to get more oxygen.