Question

Which one is both osmoregulator as well as nitrogenous waste ?

• A. Ammonia
• B. Urea
• C. Uric acid
• D. All of the above

Answer 1

The correct option is B Urea

• Osmoregulation is the process of maintaining salt and water balance (osmotic balance) across membranes within the body.
• Ammonia is a toxic by-product of protein metabolism and is generally converted to less toxic substances after it is produced then excreted.
• The only safe way to have ammonia in the body is having it at very low concentrations, so the only animals that excrete nitrogenous waste as ammonia have lots of access to water.

So, the correct answer is, 'Ammonia'.