Draw a lake showing different zones. Why are they called so? (AS 5)
The different zones are as follows:

Euphotic zone: The organisms that most reside here are floaters and swimmers having shiny bodies. Plants are green and photosynthetic. Nearly 80% of the flora and fauna are found in this zone.
Bathyal zone: This zone is dark and cold throughout the year and is devoid of photosynthetic organisms. The animals found here are mostly deep-sea predators.
Abyssal zone: Most of the plants that are seen here are red or brown in colour and animals have tubular or flat bodies.
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