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Excretory Products and their Elimination — BIOLOGY STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 ScienceBIOLOGYExcretory Products and their Elimination1 Mark
MCQ
Trimethylamine is excreted by:
  • A
    Marine teleosts
  • B
    Mollusca
  • C
    Fresh water fish
  • D
    Amphibians
✓

Answer

  1. Marine teleosts

Explanation:

Marine teleosts excrete trimethylamine oxide as the major nitrogenous waste product which is soluble in water and nontoxic in nature. It is not produced endogenously and rather comes from the food of fish (it is derived from the trimethylammonium group of choline. Dietary choline is oxidized to trimethylamine by bacteria in the gut of marine animals).

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