They are autotrophic organisms.

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(D) Autotrophic organisms are those that can synthesize their own food using sunlight (photosynthesis) or chemical energy. Phytoplankton are microscop

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Phytoplankton

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(D) Autotrophic organisms are those that can synthesize their own food using sunlight (photosynthesis) or chemical energy. Phytoplankton are microscopic aquatic plants (algae and cyanobacteria) that perform photosynthesis and serve as the primary producers in aquatic ecosystems. Zooplankton are heterotrophic,fungi are saprophytic or parasitic,and flagellates can be either autotrophic or heterotrophic,but the term 'Phytoplankton' specifically defines the autotrophic producers of the aquatic food chain.

Column $I$ (Terms)	Column $II$ (Explanation)
$1$. Stratification	$a$. Horizontal distribution of different species
$2$. Zonation	$b$. Rate of generation of Biomass in an ecosystem
$3$. Productivity	$c$. Breakdown of detritus
$4$. Decomposition	$d$. Vertical distribution of different species

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