Which statement is wrong about pollution :

Options

A. Leaded petrol is used in vehicle that has catalytic converter
B. Hot water releases from thermal power plants
C. Presence of DDT in food chain
D. Biological control does not create pollution

Answer

To determine which statement is wrong about pollution, we will analyze each statement provided in the question.

### Step-by-Step Solution:

1. **Identify the Statements**: The question presents several statements regarding pollution, specifically focusing on leaded petrol, hot water from thermal power plants, DDT in the food chain, and biological control methods.

2. **Evaluate the First Statement**: The first statement claims that leaded petrol is used in vehicles that have catalytic converters. This statement is incorrect because lead in petrol reacts with the catalysts (like platinum) used in catalytic converters, rendering them ineffective. This means that the catalytic converter cannot perform its function of converting harmful gases into less harmful emissions, leading to increased pollution.

3. **Evaluate the Second Statement**: The second statement mentions that hot water released from thermal power plants is used to rotate turbines for electricity production. This statement is correct; hot water is a byproduct of the electricity generation process and is used to drive turbines.

4. **Evaluate the Third Statement**: The third statement discusses DDT (dichlorodiphenyltrichloroethane) and its presence in the food chain. DDT is an insecticide that can accumulate in organisms, leading to biomagnification. This statement is also correct as it accurately describes the impact of DDT on the environment.

5. **Evaluate the Fourth Statement**: The fourth statement asserts that biological control does not create pollution. This is correct; biological control methods, such as using Gambusia fish to control mosquito larvae, are environmentally friendly and do not contribute to pollution.

6. **Conclusion**: After evaluating all statements, we conclude that the first statement about leaded petrol being used in vehicles with catalytic converters is the incorrect one.

### Final Answer:
The wrong statement about pollution is: "Leaded petrol is used in vehicles that have catalytic converters."

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