Question:
Study the following statements regarding osmoregulatory adaptations in marine and freshwater fish and identify the correct statements:
Statements
I. Marine fishes actively excrete excess salt through their gills.
II. Freshwater fishes have glomerular kidneys.
III. Marine fishes face the problem of exosmosis.
IV. Freshwater fishes have salt-excreting chloride cells.
Study the following statements regarding osmoregulatory adaptations in marine and freshwater fish and identify the correct statements:
Statements
I. Marine fishes actively excrete excess salt through their gills.
II. Freshwater fishes have glomerular kidneys.
III. Marine fishes face the problem of exosmosis.
IV. Freshwater fishes have salt-excreting chloride cells.
Show Hint
{Key Concepts:}
(1) Marine Fish:
- Salt excretion via gills.
- Drink seawater to combat dehydration.
(2) Freshwater Fish:
- Absorb salt via gills.
- Produce dilute urine (large glomeruli).
Updated On: Mar 18, 2026
- I, II, and III
- I and II
- II and III
- Marine Fish: - Salt excretion via gills. - Drink seawater to combat dehydration.
Show Solution
Verified By Collegedunia
The Correct Option is A
Solution and Explanation
Analysis of Statements:
- I. Correct: Marine fish use chloride cells in gills to actively excrete excess salt (NaCl).
- II. Incorrect: All fish have glomerular kidneys, but this is not unique to freshwater species.
- III. Correct: Marine fish face exosmosis (water loss) due to hypertonic seawater; they drink water and excrete salt.
- IV. Correct: Freshwater fish absorb salt via chloride cells (opposite of marine fish) to counter hypotonicity.
Conclusion: Statements I, III, and IV are correct.
- I. Correct: Marine fish use chloride cells in gills to actively excrete excess salt (NaCl).
- II. Incorrect: All fish have glomerular kidneys, but this is not unique to freshwater species.
- III. Correct: Marine fish face exosmosis (water loss) due to hypertonic seawater; they drink water and excrete salt.
- IV. Correct: Freshwater fish absorb salt via chloride cells (opposite of marine fish) to counter hypotonicity.
Conclusion: Statements I, III, and IV are correct.
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