Calcium metabolism in birds gets disturbed due to the effect of

Options

A. Mercury
B. Cadmium
C. DDT
D. Lead

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks about the disturbance of calcium metabolism in birds and which substance causes this effect. The options provided are mercury, cadmium, DDT, and lead.

2. **Identifying the Key Concept**: Calcium metabolism is crucial for birds, particularly for the formation of eggshells. A disturbance in this process can lead to thinner eggshells, which can negatively impact the survival of the embryos.

3. **Analyzing the Options**:
- **Mercury**: While mercury is toxic and can affect various biological processes, it is not specifically known for disrupting calcium metabolism in birds.
- **Cadmium**: Similar to mercury, cadmium is harmful but does not have a direct link to calcium metabolism in birds.
- **DDT (Dichloro-Diphenyl-Trichloroethane)**: This is an insecticide that has been shown to have detrimental effects on bird populations, particularly affecting calcium metabolism and leading to thinner eggshells.
- **Lead**: Lead is toxic and can affect many systems in birds, but it is not specifically known for disrupting calcium metabolism.

4. **Conclusion**: Based on the analysis, DDT is the substance that disturbs calcium metabolism in birds, leading to thinner eggshells.

5. **Final Answer**: The correct answer is **DDT (Dichloro-Diphenyl-Trichloroethane)**, which is option three.

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