Q. In ecosystem, the organisms which are incapable of producing their own food, are called as?

[A] Autotrophs

[B] Phagotrophs

[C] Saprotrophs

[D] Carnivorous

Answer: B
Notes:

Consumers – Heterotrophs or phagotrophs (other nourishing): Consumers are incapable of producing their own food (photosynthesis).  

They depend on organic food derived from plants, animals or both. 

Source: NCERT