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Nervous System

Explain the r...

Question

Explain the role of gills in the breathing of fish.

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Solution

Fish have gills which allows the underwater gaseous exchange to take place. (0.5 marks)

Gills have rows of tiny blood vessels that allow oxygen dissolved in water to diffuse into the blood. Similarly, they help to remove CO₂ from the body. (0.5 marks)

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Q. Fill in the blanks with the correct words.

1. .................... (Inhalation/Exhalation) is the first step in breathing.
2. Fish absorb oxygen from water through .................... (gills/diffusion).
3. The exchange of gases at the cellular level is called .................... (breathing/respiration).
4. Plants respire through .................... (stomata/seed).
5. Respiration in the absence of oxygen is .................... (aerobic/anaerobic).

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