Which of the followig causes bio magnifiction

Options

A. `SO_(2)`
B. Mercury
C. DDT
D. Both (2) & (3)

Answer

**Step-by-Step Solution:**

1. **Understanding Bio-magnification**:
- Bio-magnification refers to the increase in concentration of toxic substances in the tissues of organisms at successive trophic levels in a food chain.

2. **Identifying Toxic Substances**:
- The question provides four options: SO2, Mercury, DDT, and a combination of Mercury and DDT. We need to identify which of these substances are known to cause bio-magnification.

3. **Analyzing Each Option**:
- **Option A: SO2** (Sulfur Dioxide) - This is primarily an air pollutant and does not accumulate in biological tissues to cause bio-magnification.
- **Option B: Mercury** - Mercury is a heavy metal that can accumulate in aquatic organisms and is known to bio-magnify through the food chain, particularly affecting fish and predators.
- **Option C: DDT** (Dichloro-Diphenyl-Trichloroethane) - DDT is a pesticide that also accumulates in the fatty tissues of organisms and is known to bio-magnify, impacting birds and other animals at higher trophic levels.
- **Option D: Both 2 and 3** - This option suggests that both Mercury and DDT cause bio-magnification.

4. **Conclusion**:
- Based on the analysis, both Mercury (Option B) and DDT (Option C) are substances that cause bio-magnification. Therefore, the correct answer is **Option D: Both 2 and 3**.

**Final Answer**: Option D (Both Mercury and DDT cause bio-magnification).

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