Question

Why is the rate of breathing in aquatic organisms much faster than in terrestrial organisms?

• A. The amount of dissolved oxygen is fairly low in water than air.
• B. Aquatic organisms like fishes obtain oxygen from water present in dissolved state.
• C. Both A and B.
• D. None of the above.

Answer 1

Answer: (C)

Both A and B.

Aquatic organisms like fishes obtain oxygen from water present in dissolved state through their gills. Since the amount of dissolved oxygen in water is fairly low compared to the amount of oxygen in the air, the rate of breathing in aquatic organisms is much faster due to the low concentration of oxygen in the aquatic environment than that seen in terrestrial organisms.

So, the correct answer is 'Both A and B.'