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Questions and Answers
Which nitrogenous waste is the most toxic?
Which nitrogenous waste is the most toxic?
- Urea
- Ammonia (correct)
- Uric acid
- None of the above
Which process is used by animals to excrete ammonia?
Which process is used by animals to excrete ammonia?
- Ureotelism
- Uricotelism
- Ammonotelism (correct)
- None of the above
Which animals mainly excrete urea as their nitrogenous waste?
Which animals mainly excrete urea as their nitrogenous waste?
- Amphibians and marine fishes
- Mammals and marine fishes
- Mammals and terrestrial amphibians (correct)
- None of the above
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Study Notes
- Animals accumulate nitrogenous wastes like ammonia, urea, and uric acid.
- These substances must be removed totally or partially.
- Ammonia is the most toxic form of nitrogenous waste.
- Ammonotelism is the process of excreting ammonia.
- Terrestrial animals excrete lesser toxic nitrogenous wastes like urea and uric acid.
- Mammals, many terrestrial amphibians, and marine fishes mainly excrete urea.
- Reptiles, birds, land snails, and insects excrete nitrogenous wastes as uric acid.
- Uric acid is the least toxic form of nitrogenous waste.
- Urea is converted from ammonia in the liver and excreted by the kidneys.
- Uric acid is excreted in the form of a pellet or paste with a minimum loss of water.
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