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Question

Urea formation takes place through

A
Nitrogen cycle
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B
Ornithine cycle
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C
Cori cycle
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D
Kreb's cycle
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Solution

The correct option is B Ornithine cycle
Mammals, many terrestrial amphibians and marine fishes mainly excrete urea and are called as ureotelic animals. Ammonia produced by metabolism is converted into urea in the liver of these animals (in ornithine or urea cycle) and released into the blood, which is filtered and excreted out by the kidneys.

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