The main nitrogenous waste formed in the body of earthworm is/are___________?
Correct answer: B. Urea
- A. Ammonia
- B. Urea
- C. Uric acid
- D. Trimethylamine oxide
Explanation
Earthworms are mainly ureotelic, so their principal nitrogenous waste is urea, although some ammonia may also be excreted depending on water availability. The likely distractor is ammonia, because it is the simplest nitrogenous waste, but earthworms generally convert more nitrogen into the less toxic urea.
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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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