Which of the following excretory products requires the maximum amount of water for its elimination?
Ammonia is highly toxic and requires a large amount of water for its elimination, which is why it is excreted by ammonotelic animals like bony fishes.
Ref: NCERT Class 11 Biology Chapter 16: Excretory Products and their Elimination Modes of Excretion - Ammonotelism Ureotelism Uricotelism