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Excretory Products and their Elimination

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Advanced Zoology

Animal Kingdom
Structural Organisation in Animals
Digestion and Absorption
Breathing and Exchange of Gases
Body Fluids and Circulation
Excretory Products and their Elimination
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  1. In Ornithine cycle, which of the following wastes are removed from the blood?
    1. CO2 and urea
    2. Ammonia and urea
    3. CO2 and ammonia
    4. Urea and urine
Correct Option: C

Urea NH2 – CO – NH2 is formed from two molecules of ammonia and one molecule of carbon dioxide. A molecule of ammonia combines with carbondioxide to form carbonyl phosphate. It reacts with ornithine to form citrulline. Citrulline accepts another molecule of NH4+ giving rise to arginine. Arginine is hydrolysed into urea and ornithine with the help of enzyme arginase.


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