Q.

Some amount of urea may be retained in the kidney matrix of some of these animals to maintain a desired osmolarity because

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a

urea is less toxic than ammonia

b

urea is more toxic than ammonia

c

urea more soluble in water than ammonia

d

urea is less toxic than uric acid

answer is A.

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Detailed Solution

Urea is less toxic than ammonia. Some animals (e.g., mammals) retain some urea in the renal medulla to maintain the osmotic gradient desired for the excretion of the concentrated urine.

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