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    Question

    How does air pollution affect living organisms?

    >1. Sulphur dioxide irritates the respiratory tissues. 2. Nitrogen oxides, especially NO2, can irritate the lungs. 3. Suspended particles in the air aggravate our respiratory tract, leading to bronchitis and asthma. 4. Many volatile organic compounds and toxic particulates can cause mutations, reproductive problems or cancer. Select the correct answer using the codes given below.
    A 3 and 4 only Correct Answer Incorrect Answer
    B 2 and 3 only Correct Answer Incorrect Answer
    C 1 and 2 only Correct Answer Incorrect Answer
    D 1, 2, 3 and 4 Correct Answer Incorrect Answer

    Solution

    The correct answer is D

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