Distinguish between:
$(a)$ Grazing food chain and detritus food chain
$(b)$ Production and decomposition

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(N/A) Grazing food chain and detritus food chain
Grazing food chainDetritus 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.

$(b)$ Production and decomposition
ProductionDecomposition
$1$. 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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