Question

why all plants are not autotrophic in nature

Answer 1

Autotrophic are those who make their own food through photosynthesis.

Those plants who cannot make their own food due to lack of chlorophyll are non-autotrophic.

but there are some plants that depends on others for food. example humans, lion etc.

Answer 2

Hey there, 

We know that all plants are not autotrophic in nature because there are variety of plants that can not prepare their own food. 

Example- Carnivorous plants depend on others like small insects ( spiders ).