The birds excrete:
Correct answer: C. Uric acid
- A. Ammonia
- B. Urea
- C. Uric acid
- D. Acetic acid
Explanation
Birds excrete nitrogenous waste primarily in the form of uric acid. This adaptation is crucial for conserving water, as uric acid requires minimal water to be excreted, allowing birds to thrive in environments where water is scarce. In contrast, ammonia and urea require more water to be safely eliminated from the body, making them more suitable for aquatic animals and mammals, respectively. Acetic acid is not relevant to the excretory processes of birds.
This question appeared on the ETEA MDCAT 2013 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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