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Question

During severe winters when lakes are frozen, fishes still survive. Why?

A
The ice acts as an insulator and thus prevents low thermal currents to reach the bottom
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B
The bottom of the lake is not frozen
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C
The fishes can withstand very low temperatures
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D
The fishes remain in the state of hibernation
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Solution

The correct option is D The bottom of the lake is not frozen
We know that the water has maximum density at 40C. Hence during severe winters when the upper layer starts freezing , the bottom of the lake still remains in liquid form, because layers get arranged in increasing density and water at 40C is in liquid form. Hence, the non frozen part of lake thas is the bottom part of lake is where fishes live in severe winters.

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