Question

what is difference between heterotrophic organisms and autotrophic organisms

Answer 1

Autotropic organism are organisms that can produce their own food from the substances available in their surroundings using light (Photosynthesis) or chemical energy (chemosynthesis). 

Heterotropic organisms cannot synthesize their own food and rely on other organisms — both plants and animals — for nutrition.

Technically, the definition is that autotrophs obtain carbon from inorganic sources like carbon dioxide (CO2) while heterotrophs get their reduced carbon from other organisms. Autotrophs are usually plants; they are also called "self feeders" or "primary producers".

Answer 2

autotrophs prepare food by themselves example: plants and blue green alga
heterotrophs depend on autotrophs for food
example: humans and other living organisms