Question

19. In winter season, a layer of ice is formed in the lake, but the fishes and other
organism present in the lake remain alive. Why?
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Answer 1

Answer:

it may help u

Explanation:

because of anomalous behaviour of water.

below ice the temperature is 4°c

Answer 2

Answer:

This is due to anomalous behavior of water.

When water is heated from 0℃ to 4℃ it contracts instead of expanding. At 4℃ the volume of water is minimum.

In cold regions, the water on the surface of lake cools till 4℃ and moves at the bottom of the lake. In this way, when all the water in the lake is 4℃ (which is minimum) therefore there is no space for water to move downwards. Hence, the water at the surface starts to freeze and the aquatic life remain under the layer of ice.