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How do Fish Breathe? Video Lecture | Science Class 7 (Old NCERT)
FAQs on How do Fish Breathe? Video Lecture - Science Class 7 (Old NCERT)
| 1. How do fish breathe? |  |
Ans. Fish breathe through their gills. They have special organs called gills that extract oxygen from water. As water passes over the gills, oxygen is absorbed into the fish's bloodstream, and carbon dioxide is released back into the water.
| 2. Do all fish breathe in the same way? | |
Ans. No, not all fish breathe in the same way. While most fish have gills and extract oxygen from water, there are some exceptions. For example, lungfish have both gills and lungs, allowing them to breathe air when the water is low in oxygen.
| 3. Can fish breathe outside of water? | |
Ans. Most fish cannot breathe outside of water. Their gills are adapted to extract oxygen from water, and they do not have the ability to extract oxygen from the air like mammals do. However, some fish, such as mudskippers, have developed the ability to breathe air and survive short periods out of water.
| 4. How do fish get oxygen from water? | |
Ans. Fish get oxygen from water through their gills. Gills are made up of thin, feathery structures that have a rich supply of blood vessels. As water flows over the gills, oxygen molecules dissolve in the water and pass through the thin walls of the gill filaments into the fish's bloodstream.
| 5. Can fish breathe in polluted water? | |
Ans. Fish have a limited tolerance for polluted water as it can negatively affect their ability to extract oxygen from water. Pollutants such as chemicals, toxins, and heavy metals can damage the gills, making it difficult for fish to breathe properly. In severe cases, polluted water can lead to fish suffocating and dying.
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