The term 'biomagnification' is used to denote a

Options

A. Rapid of plants growth due to excessive intake of nutrients.
B. an increase in the population size of the aquatic life.
C. A decrease in the population size of the aquatic life.
D. An increase in the concentration of non- degradable pollutants as they pass through the food chain

Answer

### Step-by-Step Solution:

1. **Understanding Biomagnification**:
- Biomagnification refers to the process where the concentration of non-biodegradable pollutants increases as they move up the food chain. This occurs because these pollutants are not easily broken down or excreted by organisms.

2. **Analyzing the Options**:
- **Option A**: Rapid growth of plants due to excessive nutrient intake is incorrect. This process is known as eutrophication, not biomagnification.
- **Option B**: An increase in the population size of aquatic life does not relate to biomagnification. This option is unrelated to the concentration of pollutants.
- **Option C**: An increase in the concentration of non-biodegradable pollutants as they pass through the food chain is correct. This describes biomagnification accurately.
- **Option D**: This option is not provided in the transcript, but based on the context, it would likely be incorrect or unrelated.

3. **Examples of Biomagnification**:
- The video mentions DDT (a pesticide) as an example of a non-biodegradable pollutant. The concentration of DDT increases from zooplankton (0.04 ppm) to small fish (0.5 ppm), then to larger fish (2 ppm), and finally to fish-eating birds (25 ppm). This illustrates how pollutants accumulate in organisms at higher trophic levels.

4. **Conclusion**:
- The correct answer to the question regarding the term 'biomagnification' is that it denotes an increase in the concentration of non-biodegradable pollutants as they pass through the food chain.

### Final Answer:
The term 'biomagnification' is used to denote an increase in the concentration of non-biodegradable pollutants as they pass through the food chain.

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