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Which of the following statements is incorrect?

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Ammonia is excreted in fishes by diffusion through gill surfaces as NH⁴⁺ ions.

Ammonia is the most toxic nitrogenous waste and requires large amount of water for its excretion.

Uric acid is the least toxic nitrogenous waste and can be removed with minimum loss of water.

Ammonia is not a metabolic byproduct in ureotelic organisms.

answer is D.

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Detailed Solution

Ammonia is a metabolic byproduct in ureotelic organisms.

Ammonia that is formed in ureotelic organisms is converted to less toxic urea in the liver by ornithine cycle. It is then excreted by kidneys.

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