Question

Which one of the following pair of waste substances is removed from blood in ornithine cycle?

• A. $C{O}_2$ and urea
• B. Ammonia and urea
• C. $C{O}_2$ and ammonia
• D. Urea and sodium salt

Answer 1

Answer: (C)

$C{O}_2$ and ammonia

CO₂ and ammonia are the pairs of wastes removed from the blood in Ornithine cycle. Urea is formed in Ornithine cycle or urea cycle and urea is formed of two molecules of ammonia and one molecule of CO₂. from the blood to excrete it in urine. Most of the urea are produced in the liver. The liver cells continuously release urea into the blood and kidneys withdraw it from the blood to excrete it in urine.

So, the correct option is "Carbon dioxide and ammonia'.