Biology - Excretory Products and their Elimination Question with Solution | TestHub

Ammonia is the most toxic nitrogenous excretory product. It is highly soluble in water and requires a large amount of water for its elimination, which is why it is primarily excreted by aquatic animals.

Urea is less toxic than ammonia and requires less water for its excretion.

Uric acid is the least toxic nitrogenous waste and can be removed with a minimum loss of water.

Answer: Ammonia