In animals excess of nitrogen is excreted primarily in form of___________?
Correct answer: D. Ammonia
- A. Creatinine
- B. Trimethyamine oxide
- C. Pyrimidine
- D. Ammonia
Explanation
Ammonia is the simplest nitrogenous waste and is formed when amino acids are deaminated; many aquatic animals excrete it directly because water rapidly dilutes its toxicity. The likely distractor is creatinine, which is a waste product of muscle metabolism rather than the primary nitrogenous waste in general animals.
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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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