Which of the following animal excrete nitrogenous waste mainly as uric acid?
Correct answer: D. Birds.
- A. Hydra
- B. Planaria.
- C. Humans
- D. Birds.
Explanation
Birds excrete nitrogen mainly as uric acid, which requires little water and forms a semi-solid paste, an adaptation useful for flight and reproduction within the egg. Humans excrete urea, while hydra and planaria mainly release ammonia; students may choose humans because urea is the best-known nitrogenous waste.
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