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What are the three zones of a deep lake ...

What are the three zones of a deep lake on the basis of penetration of light.

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Epilimnion is upper stratum of water body exposed to solar radiation so is with about `21-22^(@)C` temperature in the summer. (ii) Hypolimnion is the basal part of a lake and is with lower temperature (about `5^(@)C`). (iii) Thermocline is the transitional zone between hypolomnion and epilimnion.
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