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प्रश्न
Give reasons for the following:
Even when the water in the lakes is frozen, fish can survive.
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उत्तर
Even when the water in the lakes is frozen, fishes can survive due to anomalous expansion of water, water has maximum density at 4°C and this dense water remains at the bottom of the lake and the upper layer of water is less dense and freezes but the temperature of each layer of water below increases by 1°C. Thus it is warmer in the lakes below the ice layer. This helps the fishes to survive.C and this dense water remains at the bottom of the lake and the upper layer of water is less dense and freezes but the temperature of each layer of water below increases by 1°C. Thus it is warmer in the lakes below the ice layer. This helps the fishes to survive.
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संबंधित प्रश्न
Give reason for Sea water does not freeze at 0°C.
Explain the following:
In cold regions in winter, the rocks crack due to anomalous expansion of water.
Draw a graph to show the variation in density of water with temperature in the range from 0°C to 10°C.
How do fishes survive in frozen lakes?
Explain, why are soft drink bottles not completely filled?
A deep pond of water has its top layer frozen. What will be the likely temperature of water layer just in contact with ice?
A deep pond of water has its top layer frozen. What will be the likely temperature of water layer at the bottom of the pond?
_______ apparatus is used to study the anomalous behaviour of water.
Match the columns:
| Column ‘A’ | Column ‘B’ |
| The density of water is maximum at | (a) 0°C |
| (b) 4°C | |
| (c) 100°C |
