Birds excrete uric acid as a semi solid paste because uric acid
Correct answer: A. is almost insoluble in water, so very little water is lost
- A. is almost insoluble in water, so very little water is lost
- B. is highly soluble in water
- C. is converted to urea in the cloaca
- D. is released as a gas
Explanation
Precipitating uric acid saves water and keeps the egg clean, since an embryo sealed in a shell cannot dilute soluble wastes. Both advantages explain why birds and reptiles chose this route.
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About Kidney and Urinary System
The kidney and urinary system remove nitrogenous wastes, regulate water and ion balance, and help maintain blood pH through filtration, selective reabsorption and secretion. Questions cover nephron structure, ultrafiltration, the loop of Henle, collecting ducts, urine formation and the roles of ADH and aldosterone, while distinguishing excretion from egestion.
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