Upper part of sea/aquatic ecosystem contains

Options

A. Plankton
B. Nekton
C. Both(a) and(b)
D. Benthos

Answer

A

Explanation

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.