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Question
Which among the following organisms will be most affected if the dissolved oxygen in water is reduced?
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Solution
- Fishes have gills that absorb the oxygen dissolved in water. Unlike other aquatic animals, fishes depend entirely on the oxygen content present in water. So, a decrease in the level of oxygen will affect them the most.
- Frogs absorb the dissolved oxygen in water, but can also breathe in oxygen from the air. Therefore, they would be affected less, compared to fishes.
- Whales and dolphins are mammals. They come onto the water surface and breathe air into their lungs through their nostrils or blowholes. Hence, they would be the least affected.
- Fishes have gills that absorb the oxygen dissolved in water. Unlike other aquatic animals, fishes depend entirely on the oxygen content present in water. So, a decrease in the level of oxygen will affect them the most.
- Frogs absorb the dissolved oxygen in water, but can also breathe in oxygen from the air. Therefore, they would be affected less, compared to fishes.
- Whales and dolphins are mammals. They come onto the water surface and breathe air into their lungs through their nostrils or blowholes. Hence, they would be the least affected.
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