| Grazing food chain | Detritus food chain |
| $1$. In this food chain, energy is derived from the Sun. | $1$. In this food chain, energy comes from organic matter (or detritus) generated in trophic levels of the grazing food chain. |
| $2$. It begins with producers, present at the first trophic level. The plant biomass is then eaten by herbivores, which in turn are consumed by a variety of carnivores. | $2$. It begins with detritus such as dead bodies of animals or fallen leaves, which are then eaten by decomposers or detritivores. These detritivores are in turn consumed by their predators. |
| $3$. This food chain is usually large. | $3$. It is usually smaller as compared to the grazing food chain. |
| Production | Decomposition |
| $1$. It is the rate of producing organic matter (food) by producers. | $1$. It is the process of breaking down complex organic matter or biomass from the body of dead plants and animals with the help of decomposers into inorganic raw materials such as $CO_{2}, H_{2}O,$ and other nutrients. |
| $2$. It depends on the photosynthetic capacity of the producers. | $2$. It occurs with the help of decomposers. |
| $3$. Sunlight is required by plants for primary production. | $3$. Sunlight is not required for decomposition by decomposers. |
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