What is primary source of energy in detritus food chain ?

Explanation

**Step-by-Step Solution:**

1. **Understanding the Detritus Food Chain**: The detritus food chain is a type of food chain that primarily involves decomposers and detritivores. It starts with the breakdown of organic matter from dead organisms and waste products.

2. **Identifying the Primary Source of Energy**: In any food chain, the primary source of energy is the initial energy input that supports the entire chain. In the case of the detritus food chain, this energy comes from the organic matter that is decomposing.

3. **Sources of Organic Matter**: The organic matter in the detritus food chain includes dead plants, fallen leaves, dead animals, and organic waste such as kitchen scraps. These materials are rich in nutrients and serve as food for decomposers.

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