Which of the following fishes excrete large volume of diluted urine?
Correct answer: B. Fresh water fishes
- A. Bony Marine fishes
- B. Fresh water fishes
- C. Both depending upon the surrounding water
- D. None of these
Explanation
Freshwater fishes gain water by osmosis because their body fluids are more concentrated than the surrounding water, so they excrete a large volume of dilute urine. Students may choose marine bony fishes, but they lose water to seawater and therefore produce smaller volumes of more concentrated urine.
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About Excretion
Excretion removes metabolic wastes such as carbon dioxide, urea and excess salts, and differs from egestion, which removes undigested food. Questions cover kidney structure, nephron ultrafiltration, selective reabsorption and urine formation, along with the excretory roles of the lungs, skin and liver in maintaining homeostasis.
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