One of the ways through which freshwater fish compensate the loss of salts from their bodies is that they
Correct answer: C. Uptake salts by gills and skin via active transport
- A. Drink large amounts of water
- B. Produce small volumes of concentrated urine
- C. Uptake salts by gills and skin via active transport
- D. Retain adequate concentrations of urea in their bodies
Explanation
The correct answer is that freshwater fish uptake salts by gills and skin via active transport (Option C). Freshwater fish live in an environment where the concentration of salts is lower than in their bodies, causing them to lose salts. To counteract this, they actively absorb salts from the water through their gills and skin.Option A is incorrect because drinking large amounts of water would exacerbate the problem of dilution. Option B is incorrect because freshwater fish produce a large volume of dilute urine to get rid of excess water, not concentrated urine. Option D is incorrect as retaining urea is not a strategy used by freshwater fish; it is more relevant to marine organisms.
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About Kidney and Urinary System
The kidney and urinary system remove nitrogenous wastes, regulate water and ion balance, and help maintain blood pH through filtration, selective reabsorption and secretion. Questions cover nephron structure, ultrafiltration, the loop of Henle, collecting ducts, urine formation and the roles of ADH and aldosterone, while distinguishing excretion from egestion.
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