Biology Medium fpsc

Which gas do fish primarily extract from water using their gills?

Q: Which gas do fish primarily extract from water using their gills?

Correct Answer: Oxygen. Fish gills contain thin filaments rich in blood vessels that extract dissolved oxygen from water as it passes over them. This efficient gas exchange system allows fish to respire underwater without surfacing for air.

A Oxygen
B Carbon dioxide
C Nitrogen
D Hydrogen

Correct Answer: Option A — Oxygen

Explanation:

Fish gills contain thin filaments rich in blood vessels that extract dissolved oxygen from water as it passes over them. This efficient gas ...

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Subject	Biology
Difficulty	Medium
Exam Types	fpsc
Correct	Option A

Which gas do fish primarily extract from water using their gills?

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