Multiple choice

In marine telecost fish Na+ and CI- ions are excreted by

  1. gills

  2. kidneys

  3. neuromast organs

  4. scroll valve
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A Correct answer
Explanation

Marine teleost fish live in a hyperosmotic environment and constantly lose water to their surroundings. They actively excrete excess sodium and chloride ions through specialized cells (chloride cells) in their gills. Kidneys primarily excrete divalent ions like Mg2+ and SO42-, while conserving water by producing small volumes of isotonic urine.

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