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Which of the following statements is correct regarding the ‘Pr | Sarat Chandra IAS Academy

Which of the following statements is correct regarding the ‘Profundal Zone’ –
Anonymous Quiz
12%
Only respiration activity takes place.
27%
It is the upper layer of aquatic ecosystems, upto which light penetrates.
41%
The depth of this zone depends on the transparency of water.
20%
It extends from the water surface down to where the light level is 1% of that at the surface.