Aquatic animals excrete nitrogenous waste commonly in the form of_____________?
Correct answer: A. Ammonia
- A. Ammonia
- B. Urea
- C. Uric acid
- D. Trimethylamine oxide
Explanation
Aquatic animals commonly excrete ammonia because it is highly toxic but can be rapidly diluted and removed in abundant water. Students may choose urea because it is a common nitrogenous waste in mammals, but urea formation is more useful where water conservation is necessary.
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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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