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Class Mammalia

Which one of ...

Question

Which one of the following statements is correct with respect to salt water balance inside the body of living organisms?

A

When water is not available camels do not produce urine but store urea in tissues.

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B

Salmon fish excretes lot of stored saIt through gill membrane in fresh water.

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C

Paramecium discharges concentrated salt solution by contractile vacuoles.

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D

The body fluids of fresh water animals are generally hypotonic to surrounding water.

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Solution

The correct option is A When water is not available camels do not produce urine but store urea in tissues.
When water is not available, the camels produce dry faeces and concentrated urine but store urea in tissues and depend upon metabolic water. Fat is stored in the hump and water is obtained from its metabolism.
Therefore, the correct answer is option A.

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