WAEC - Biology (2000 - No. 10)
In which of the following organisms is ammonia excreted as a waste product?
Man
Bird
Amoeba
Spirogyra
Spiegazione
Ammonia is a waste product excreted by aquatic animals, as well as some other organisms, including Amoeba.
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Amoeba's main waste products are ammonia and carbon dioxide. It excretes waste through diffusion, which is the movement of molecules from a higher concentration to a lower concentration.
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Other organisms excrete nitrogenous wastes in different forms, including:
- Birds and lizards: Excrete nitrogenous wastes as uric acid
- Humans: Excrete urea
- Reptiles and many terrestrial invertebrates: Produce uric acid