Shell of egg in bird becomes thin (not properly formed )due to the pollution caused by DDT pesticide .this occurs due to disturbed

Options

A. calcium metabolism
B. phosphorus metabolism
C. sodium metabolism
D. potassium metabolism

Answer

### Step-by-Step Solution:

1. **Understanding the Problem**: The question states that the shells of bird eggs become thin due to pollution caused by DDT (Dichloro-Diphenyl-Trichloroethane), a pesticide. We need to identify which metabolic process is disturbed as a result.

2. **Identifying the Effect of DDT**: DDT is known to have harmful effects on wildlife, particularly birds. One of the significant impacts is the thinning of eggshells, which leads to increased fragility and a higher risk of breakage.

3. **Metabolic Processes Involved**: The question provides four options related to metabolism:
- Calcium metabolism
- Phosphorus metabolism
- Sodium metabolism
- Potassium metabolism

4. **Analyzing Calcium Metabolism**: Calcium is crucial for the formation of eggshells in birds. The eggshell is primarily composed of calcium carbonate, and thus, calcium metabolism is directly linked to eggshell integrity.

5. **Role of Calcium ATPase Pump**: The calcium ATPase pump is responsible for transporting calcium ions into cells. DDT disrupts this pump's function, leading to reduced calcium levels available for eggshell formation.

6. **Conclusion**: Since the thinning of eggshells is primarily due to the disturbance in calcium metabolism caused by DDT, the correct answer is **A: Calcium metabolism**.