a. Explain the following.
What is the role of anomalous behaviour of water in preserving aquatic life in
regions of cold climate?
Answers
Answer:
1. The existence of fish and other aquatic life is possible due to anomalous expansion
of water.
2. In regions of cold climate, the atmospheric temperature falls below 0°C.
3. As the atmospheric temperature falls: the water at the surface of ponds and lakes
starts contracting. Its volume decreases and density increases.
4. The water with higher density moves downward and the water with
lower density moves upward. This continues till the temperature of water becomes
4°C.
5. When the temperature of water starts decreasing below 4°C, water starts expanding
instead of contracting. Its volume increases, density decreases and it remains at the surface.
6. Soon, the surface water gets converted into sheet of ice. This sheet of ice acts as
an insulator and does not allow the transfer of heat from water to the atmosphere
7. Therefore, the water below the sheet of ice remains at 4°C.
8. Hence, due to the anomalous expansion of water, aquatic life (plants and animals),
is preserved in regions of cold climate.
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Answer:
anomalous expansion of water refers to water's unusual ability to expand instead of contacting when cooled....this layer of ice acts as an insulation and prevents that from escaping the water and cold out side from coming inside the water. thus it helps in survival of aquatic animals and fishes.