Which of the following statements is incorrect?

Options

A. Suspended particulate matter can lead to respiratory problems like bronchitis and asthma.
B. Chlorine kills harmful microorganisms and germs present in water.
C. CNG is called a cleaner fuel as it burns completely.
D. DDT is a biodegradable compound which is metabolised within the organisms body.

Explanation

To determine which statement is incorrect, we will analyze each of the four statements provided:

1. **Suspended particulate matter can lead to respiratory problems like bronchitis and asthma.**
- This statement is correct. Suspended particulate matter (SPM) in the air can irritate the respiratory system and lead to conditions such as bronchitis and asthma.

2. **Chlorine kills harmful microorganisms and germs present in water.**
- This statement is also correct. Chlorine is commonly used to disinfect water and effectively kills harmful microorganisms and germs, making the water safe for consumption.

3. **CNG is called a cleaner fuel.**
- This statement is correct as well. Compressed Natural Gas (CNG) is considered a cleaner fuel compared to other fossil fuels because it burns more completely and produces fewer pollutants.

4. **DDT is a biodegradable compound which is metabolized within the organism's body.**
- This statement is incorrect. DDT (Dichloro-Diphenyl-Trichloroethane) is a pesticide that is not biodegradable. It accumulates in the tissues of organisms and can lead to biomagnification, where its concentration increases as it moves up the food chain.

Based on the analysis, the incorrect statement is about DDT being biodegradable.

**Final Answer: The incorrect statement is: "DDT is a biodegradable compound which is metabolized within the organism's body."**

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