Which of the following organisms eliminate nitrogenous waste mainly in the form of uric acid?
Correct answer: C. Birds
- A. Freshwater Fish
- B. Amphibians
- C. Birds
- D. Mammals
Explanation
Uric acid is almost insoluble, so it can be excreted as a paste with very little water, which suits birds both for flight and for developing inside a shelled egg where waste must be stored safely. Freshwater fish excrete ammonia directly into the surrounding water, and mammals and adult amphibians make urea. The choice of waste product tracks how much water the animal can afford to lose.
This question appeared on the UHS MDCAT 2025 paper, which you can sit online with every answer explained.
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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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