Accumulation of non-biodegradable pesticides in the food chain in increasing amount at each higher trophic level is known as

Options

A. eutrophication
B. pollution
C. bio-magnification
D. accumulation

Explanation

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks about the accumulation of non-biodegradable pesticides in the food chain, which increases at each higher trophic level.

2. **Identifying Non-Biodegradable Pesticides**: Non-biodegradable pesticides are chemicals that do not break down naturally in the environment. They persist and can be harmful to ecosystems.

3. **Pesticide Runoff**: When it rains, these pesticides can be washed away from agricultural fields into nearby water bodies, such as rivers and lakes. This process is known as runoff.

4. **Accumulation in the Food Chain**: Once in the water, these pesticides can be absorbed by aquatic organisms. For example, phytoplankton (like algae) absorb these chemicals first.

5. **Trophic Levels**: In a food chain, organisms are arranged in trophic levels. The first level consists of producers (like phytoplankton), the second level consists of primary consumers (like zooplankton), and so on. As you move up the trophic levels, each level consumes the one below it.

6. **Bioaccumulation**: As phytoplankton absorb pesticides, they accumulate these toxins. When zooplankton eat phytoplankton, they also accumulate the pesticides. This process continues up the food chain.

7. **Bio-magnification**: The concentration of pesticides increases at each trophic level. This phenomenon, where the concentration of non-biodegradable substances increases as they move up the food chain, is known as bio-magnification.

8. **Conclusion**: Therefore, the correct term for the accumulation of non-biodegradable pesticides in the food chain at increasing amounts at each higher trophic level is **bio-magnification**.

**Final Answer**: The correct answer is **bio-magnification**.

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