High concentrations of accumulated DDT in birds

Options

A. 1)kills pathogens in their blood
B. 2)causes sterility by affecting gametogenesis
C. 3)leads to premature breaking of eggs
D. 4)causes spasticity of the muscles of the body

Answer

### Step-by-Step Solution:

1. **Understanding DDT**: DDT stands for dichloro-diphenyl-trichloroethane. It is a colorless and odorless crystalline compound used as an insecticide.

2. **Environmental Impact**: DDT can enter water bodies through runoff from agricultural fields, especially after heavy rainfall.

3. **Bioaccumulation**: Once in the water, DDT accumulates in the bodies of aquatic organisms, such as fish. This process is known as bioaccumulation.

4. **Biomagnification**: When birds eat these contaminated fish, DDT accumulates in their bodies as well. With each successive trophic level, the concentration of DDT increases, a phenomenon known as biomagnification.

5. **Effects on Birds**: High concentrations of DDT disrupt calcium metabolism in birds, leading to physiological changes.

6. **Thinning of Eggshells**: The disruption in calcium metabolism results in the thinning of eggshells, making them fragile.

7. **Premature Breaking of Eggs**: Due to the thinning of the eggshells, the eggs are more likely to break prematurely.

8. **Conclusion**: Among the given options, the correct answer is that high concentrations of accumulated DDT in birds lead to premature breaking of eggs.

### Answer:
The correct option is: **It leads to premature breaking of eggs.**

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