1.

Upper part of sea/aquatic ecosystem containsA. PlanktonB. NektonC. Both(a) and(b)D. Benthos

Answer» Correct Answer - A
Planktons are passively floating organisms living in the surface layers of water due to absence of locomotory organs, they are of two types: phytoplankton (photosynthetic plankton) and zooplankton.
While nektons are actively floating organisms and benthos are found in the bottom and are usually sessile.


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