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 certain pollutants increases as they move up the food chain. This means that organisms at higher trophic levels accumulate higher concentrations of these pollutants than those at lower levels.

2. **Identifying the Pollutant**:
- The process typically involves non-biodegradable pollutants, such as pesticides (e.g., DDT), heavy metals, and other harmful substances. These pollutants do not break down easily and can persist in the environment.

3. **Example of Biomagnification**:
- Consider DDT, a pesticide. In water, the concentration might be very low (e.g., 0.003 parts per billion). As small organisms like zooplankton consume this water, they accumulate DDT, increasing its concentration (e.g., 0.04 parts per billion).

4. **Progression Through the Food Chain**:
- As small fish eat zooplankton, the concentration of DDT increases further (e.g., 0.5 parts per million). Larger fish that consume smaller fish will have an even higher concentration (e.g., 2 parts per billion). Finally, fish-eating birds that consume large fish can have extremely high concentrations of DDT (e.g., 25 parts per million).

5. **Conclusion**:
- Therefore, biomagnification is characterized by the increasing concentration of non-biodegradable pollutants as they pass through the food chain. The correct answer to the question is that biomagnification denotes an increase in concentration of non-biodegradable pollutants as they move through the food chain.

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

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