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. 

(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 1

The correct option is (a) When water is not available camels do not produce urine but store urea in tissues.

Explanation:

The dwelling place of camels is desert where there is scarcity of water, camel excrete a highly concentrated urine to conserve water. They do not sweat till body temperature rises about 55^o C - 60^o C. Camels can also tolerate desiccation upto 40% cellular content.