The concentration of DDT is the highest in

Options

A. Primary consumer
B. Producers
C. Top consumer
D. Decomposers

Answer

### Step-by-Step Solution

1. **Understanding Biomagnification**:
- Biomagnification is the process where the concentration of toxic substances, such as DDT, increases at each successive trophic level in a food chain. This means that as we move from producers to top consumers, the levels of toxins accumulate.

2. **Identifying Trophic Levels**:
- The trophic levels in an ecosystem can be categorized as:
- Producers (e.g., plants)
- Primary consumers (e.g., herbivores)
- Secondary consumers (e.g., small carnivores)
- Tertiary consumers (e.g., larger carnivores)
- Top consumers (e.g., apex predators)

3. **Accumulation of DDT**:
- DDT enters the ecosystem, often through water sources, and is absorbed by small organisms like fish.
- When small fish consume DDT, they accumulate it in their bodies.
- Larger fish that eat multiple small fish will have a higher concentration of DDT because they are consuming multiple sources of the toxin.

4. **Progression Up the Food Chain**:
- As you move up the food chain, each consumer accumulates more DDT. For example:
- If a small fish has a concentration of X DDT, and a larger fish eats ten small fish, the larger fish will have a concentration of 10X DDT.
- If a bird eats two of these larger fish, it will then have a concentration of 20X DDT.

5. **Conclusion**:
- Therefore, the highest concentration of DDT will be found in the top consumers, as they are at the end of the food chain and have accumulated toxins from all the organisms they consume.

### Final Answer:
The concentration of DDT is highest in **top consumers**.

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