Which one of the following has least toxicity?
Correct answer: C. Uric acid
- A. Ammonia
- B. Urea
- C. Uric acid
- D. All are highly toxic
Explanation
The correct answer is Uric acid. Uric acid is the least toxic nitrogenous waste product because it is almost insoluble in water and can be excreted with minimal water loss, making it less harmful to the organism. In contrast, ammonia is highly toxic due to its solubility and requires significant amounts of water for excretion. Urea is less toxic than ammonia but still more toxic than uric acid. The option stating 'All are highly toxic' is incorrect, as uric acid is not highly toxic.
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About Homeostasis
Homeostasis maintains a stable internal environment through the kidney and urinary system, thermoregulation and excretion. The kidney topics include filtration, selective reabsorption, urine formation and water balance, while thermoregulation involves sweating, vasodilation, vasoconstriction and hormonal control; excretion is different from egestion, which removes undigested food.
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