alleryMain nitrogenous waste in humans is:
AUrea (forms via ornithine/urea cycle in liver from ammonia)
BCreatine
CUric acid
DAmmonia
Answer & Solution
Correct answer: A. Urea (forms via ornithine/urea cycle in liver from ammonia)
Humans are ureotelic (urea is main waste).
Liver converts toxic ammonia to less toxic urea via urea cycle. Excreted via kidneys.
Reptiles, birds: uricotelic (uric acid, less water).
**Aquatic animals:** ammonotelic (ammonia directly diluted in water).
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