Question

Choose the correct statement regarding the elimination of the nitrogenous wastes:

• A. Ammonia excretion is feasible for terrestrial organisms
• B. Urea is excreted as a precipitate and doesn’t require water
• C. Uric acid requires ample water for its excretion
• D. Uric acid is the least toxic out of all other nitrogenous wastes

Answer 1

The correct option is D Uric acid is the least toxic out of all other nitrogenous wastes

There are 3 types of nitrogenous wastes - ammonia, urea and uric acid.

Uric acid is the least toxic and requires the least amount of water for disposal. It is excreted in the form of pellets or paste.

Ammonia is very toxic and requires large amount of water for excretion. Mostly, aquatic organisms excrete nitrogenous wastes in the form of ammonia. Terrestrial animals cannot afford to lose so much water.

Urea is less toxic than ammonia and requires lesser amount of water than ammonia for excretion.