Question

Which is the most toxic form of nitrogenous waste? Name an organism that excretes it.

Answer 1

Answer:

Nitrogenous wastes in the body tend to form toxic ammonia, which must be excreted. Mammals such as humans excrete urea, while birds, reptiles, and some terrestrial invertebrates produce uric acid as waste.

Answer 2

Answer:

The most toxic form of nitrogenous waste is ammonium.

Aquatic organisms like fishes excrete ammonia

Explanation:

Ammonia is a very small molecule. It requires a large amount of water to be excreted. Hence, terrestrial animals can't afford to lose so "much of water". Also, even moderate amount of ammonia present in blood can be "life threatening". So,ammonia can't be excreted by humans. So, it is converted into urea.