(i) In autotrophic nutrition, an organism synthesises its own organic food from simple inorganic materials like carbon dioxide, water and minerals present in the surroundings by using sunlight energy. In heterotrophic nutrition, an organism cannot synthesise its own food, it depends on other organisms for food.
(ii) Autotrophic nutrition takes place in green plants and certain bacteria which can carry out photosynthesis.
Heterotrophic nutrition occurs in all animals, and non-green plants which cannot carry out photosynthesis.
