A) get rid of \[{{H}_{2}}O\] and gain salt
B) get rid of salt and gain \[{{H}_{2}}O\]
C) Both [a] and [b]
D) None of the above
Correct Answer: A
Solution :
The fresh water osmolarity is usually much less than 50 \[mosm{{L}^{-1}}\]while the blood osmolarity of fresh water vertebrates is 200 to 300 \[mosm{{L}^{-1}}\]. Thus the body fluids of fresh water animals are generally hypertonic to surrounding medium. Therefore, in fresh water, bony fish can survive by getrid of excess water, which enters the body passively due to osmotic gradient and also to compensate for the salt lose by diffusion. In marine water, the osmolarity is of about 1000 \[mosm{{L}^{-1}}\]. Thus, marine bony fishes have the body fluids hypotonic to sea water of result they lose water from the body throng gill membranes, or and anal membranes. m compensate for the water loss marine bony fishes drink sea water which results in a gain. of excess salts.
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