Question

all green plants are not autotrophs ? how to justify

Answer 1

all plants are not autotrophs because some plants don't make food by their own and they depend on on other living organisms for food

Answer 2

Yes plants are not autotrophs they are hetrotrophes because they are green in colour and they able to make her food
Plants use some organic compound like Water or Carbon dioxide to synthesis them and make her food Glucose,water and oxygen in by product
And this process is called photosynthesis
It is a anabolic process
I think my answer satisfied you