Increase in concentration of the toxicent at successive trophic levels is known as

Options

A. Biomagnification
B. Biodeterioration
C. Biotransformation
D. Biogeochemcial cyling

Answer

**Step-by-Step Solution:**

1. **Understanding the Concept**: The question asks about the increase in concentration of a toxic substance at successive trophic levels in an ecosystem. This phenomenon is crucial in understanding how toxins move through food chains.

2. **Identifying the Term**: The specific term used to describe this process is "bio-magnification." Bio-magnification refers to the increasing concentration of toxic substances in the tissues of organisms at each successive level of the food chain.

3. **Explaining the Process**:
- Start with the primary producers (like phytoplankton) that absorb toxins from their environment. For example, if the concentration of a toxin like DDT in water is 0.003 parts per million (ppm), phytoplankton will absorb this toxin.
- Next, when small organisms like zooplankton consume the phytoplankton, they accumulate the toxins, leading to a higher concentration (e.g., 0.04 ppm).
- As small fish eat zooplankton, the concentration of the toxin increases further (e.g., 0.5 ppm).
- Larger fish that consume smaller fish will have an even higher concentration (e.g., 2 ppm).
- Finally, top predators like eagles that consume large fish will have the highest concentration of the toxin (e.g., 25 ppm).

4. **Conclusion**: Based on the explanation and the examples provided, the correct answer to the question is "bio-magnification." This term specifically describes the process of increasing toxin concentration at each trophic level.

5. **Final Answer**: The answer to the question is **bio-magnification**.

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