Question

The gills help the fish to ____________.

• A. take in oxygen from air
• B. take in oxygen dissolved in water
• C. absorb nutrients present in water
• D. release waste substances in water

Answer 1

The correct option is B take in oxygen dissolved in water

• In fishes, gills are the respiratory organ and are richly supplied with blood vessels.
• Gills are richly supplied with blood vessels.
• As water enters through the mouth, oxygen dissolved in water diffuses into their blood through these blood vessels.