Amount of water required to excrete 1gN of Urea is_________?
Correct answer: B. 50 ml
- A. 1 ml
- B. 50 ml
- C. 100 ml
- D. 150 ml
Explanation
Urea requires about 50 mL of water for the excretion of 1 g of nitrogen, so the value is 50 mL per gram of nitrogen. The likely distractor is 100 mL, which may result from doubling the standard approximate value or confusing urea with a more water-demanding nitrogenous waste.
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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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