| Autotroph | Heterotroph | |
| 1. | Food: It manufactures its own food. | It obtains its food from outside source. |
| 2. | Chlorophyll: It has chlorophyll for performing photosynthesis. | Chlorophyll is absent. |
| 3. | Energy: It is obtained from sunlight and changed into chemical energy. | It does not require an external source of energy as the same is present in food obtained from outside. |
| 4. | Digestion: It is absent. | Food obtained from outside is digested before being absorbed and assimilated. |