Why do fish need to keep water flowing through the mouth over the gills?
Answer and explanation
Correct answer: To bring dissolved oxygen in water to the gills
The governing concept is aquatic respiration through gills. Fish cannot use gaseous oxygen from the atmosphere in the same way as land animals; they obtain oxygen dissolved in water. Continuous water flow brings fresh water over the thin gill surfaces, where oxygen diffuses into the blood and carbon dioxide diffuses out. Thus option A is correct, while the other choices describe unrelated processes.
Frequently asked questions
What is the correct answer to this question?
To bring dissolved oxygen in water to the gills
Why is this the correct answer?
The governing concept is aquatic respiration through gills. Fish cannot use gaseous oxygen from the atmosphere in the same way as land animals; they obtain oxygen dissolved in water. Continuous water flow brings fresh water over the thin gill surfaces, where oxygen diffuses into the blood and carbon dioxide diffuses out. Thus option A is correct, while the other choices describe unrelated processes.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: World of Living. Topic: Life Processes.
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