A) When water is not available, camels do not produce urine but store urea in tissues.
B) Salmon fish excretes lot of stored salt through gill membrane in fresh water.
C) Paramecium discharges concentrated salt solution by contractile vacuoles.
D) The body fluids of fresh water animals are generally hypotonic to surrounding water.
Correct Answer: A
Solution :
[a] When water is not available, the camels produce dry faeces and concentrated urine. One of the best sources of metabolic water in camels is oxidation of food in the hump.
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