Question

What is the role of anomalous
behaviour of water in preserving
aquatic life in regions of cold
climate?

Answer 1

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Anomalous expansion of water refers to water's unusual ability to expand instead of contracting when cooled. In winters in very cold areas this ability causes water to form a layer of ice above the lakes/rivers/oceans. This layer of Ice acts as an insulation and prevents heat from escaping the water and the cold outside from coming inside the water. Thus, it helps in survival of aquatic animals and fishes.

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Answer 2

In cold countries in winter a layer of ice is formed on the surface of lakes when the atmospheric temperature falls below 0'c. However below this layer, there is a water at 4'c. Ice being bad conductor of heat does not allow transfer of heat from this water to atmosphere.