# Autotrophic components of a pond ecosystem include

$\begin{array}{1 1}(a)\;\text{Phytoplankton}\\(b)\;\text{Algae}\\(c)\;\text{Floating plants}\\(d)\;\text{All}\end{array}$

Autotrophic components of a pond ecosystem include phytoplankton,algae,floating plants.
Hence (d) is the correct answer.