Multiple choice What is the role of liver in excretion? It excretes a lot of nitrogenous waste in the form of urine. It converts ammonia into uric acid. It expels out CO2 gas. It excretes water from the body. Reveal answer Fill a bubble to check yourself B Correct answer Explanation Liver converts the highly toxic ammonia to soluble and non-toxic uric acid which is later passed out of the body by kidney in the form of urine.