Home ยป Which of the following is not the major form of nitrogenous wastes? Excretory System MCQs Which of the following is not the major form of nitrogenous wastes? January 24, 2022 1 View Q. Which of the following is not the major form of nitrogenous wastes? A. Ammonia B. Urea C. Carbon dioxide D. Uric acid Answer: Carbon dioxide