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).
Keep practising Unit 8Q: Toxicology, Environmental Hazards & Health
Browse all Unit 8Q: Toxicology, Environmental Hazards & Health questions for AP Biology, or explore more Biology topics.
Related questions
Granulocytes among WBCs includePlasma without clotting factors is calledHepatic portal system carries blood fromNormal resting blood pressure of a healthy adult is approximatelyThe first heart sound ('lub') is produced byThe pacemaker of the human heart is thePersons with blood group O are calledWhich leucocyte is the MOST abundant in human blood?