Question:

Nitrogenous waste which is less toxic, soluble in water and formed during ornithine cycle is ----------------.

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The ornithine cycle in the liver converts toxic ammonia into urea, which is less toxic and water soluble.
Updated On: Nov 12, 2026
  • Urea
  • Uric acid
  • Ammonia
  • Amino acid
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The Correct Option is A

Solution and Explanation

Step 1: Understanding the Concept
The ornithine cycle takes place in the liver of ureotelic animals.

Step 2: Product
Ammonia from amino acid breakdown combines with carbon dioxide in this cycle to form urea.
Urea is much less toxic than ammonia and dissolves readily in water.

Step 3: Other options
Uric acid is almost insoluble and not made in this cycle, ammonia is highly toxic, and amino acids are not wastes.

Step 4: Conclusion
The waste described is urea.

Final Answer:
The waste is urea. \[ \boxed{\text{(A) }\text{Urea}} \]
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