The term biomagnification refers to:

Options

A. Growth of organisms due to food consumption
B. Increase in population size
C. Blowing up of environmental issues by man
D. Increase in the concentration of non degradable pollutants as they pass through food chain

Answer

### Step-by-Step Solution:

1. **Understanding Biomagnification**:
- Biomagnification is a process that refers to the increasing concentration of toxic substances in organisms at each successive level of the food chain.

2. **Analyzing the Options**:
- **Option A**: Growth of organisms due to food consumption - This is not related to biomagnification, as it refers to general growth rather than concentration of pollutants.
- **Option B**: Increase in population size - This does not pertain to the concentration of pollutants and is therefore incorrect.
- **Option C**: Blowing up of environmental issues by man - While this is a concern, it does not define biomagnification.
- **Option D**: Increase in the concentration of non-biodegradable pollutants as they pass through the food chain - This accurately describes biomagnification.

3. **Conclusion**:
- Based on the definitions and analysis of the options, the correct answer is **Option D**: increase in the concentration of non-biodegradable pollutants as they pass through the food chain.