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

Options

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 when 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

Answer

A

Explanation

(a) Camels produce nearly dry faeces and highly concentrated urine. In the scarcity of water they use only metabolic water and store urea in their body tissue.