Autotroph
Spirogyra being a fresh water chlorophycean alga prepares its own food by photosynthesis. Hence it is an autotroph.
heterotroph
The viper-fish is a heterotroph.
No, Spirostomum are heterotrophs. They feed on bacteria using phagocytosis.
Heterotroph
heterotroph
Heterotroph
heterotroph
Heterotroph.
heterotroph
heterotroph.
Heterotroph.