ECOLOGY
EXCRETORY PRODUCTS AND THEIR ELIMINATION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Among the following choices, the most concentrated urine is excreted by ____
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frogs
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freshwater bass
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human
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kangaroo rats
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Explanation:
Detailed explanation-1: -the kangaroo rat Dipodomys merriami is one of a number of mammalian species that are known to concentrate their urine to more than 6, 000 mosmol/kgH2O (5), nearly twice as high as that of the laboratory rat.
Detailed explanation-2: -Camel excrete concentrated urine.
Detailed explanation-3: -Answer. Rodents generally have kidneys with a larger medullary area and produce more concentrated urine than bats and other mammals.
Detailed explanation-4: -The kangaroo rat (photo, right) is adapted to very dry environments. It is able to conserve water by producing uric acid instead of urea as an excretory product, and is therefore calssified as a uricotelic organism (as are birds and repitiles).
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