Write notes on : (i) Food chain (ii) Trophic level.

Explanation

### Step-by-Step Solution

**(i) Food Chain**

1. **Definition**: A food chain is a linear sequence that illustrates how energy and nutrients flow from one organism to another within an ecosystem. It represents the transfer of energy from producers to top consumers through various trophic levels.

2. **Energy Transfer**: In a food chain, energy is transferred in a unidirectional manner, meaning it flows in one direction—from producers to consumers. Each organism occupies a specific position in this chain.

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