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Due to increasing air-borne allergens and pollutants, many people in urban areas are suffering from respiratory disorder causing wheezing due to:

1. (a) benign growth on mucus lining of nasal cavity.
2. (b) inflammation of bronchi and bronchioles.
3. (c) proliferation of fibrous tissues and damage of the alveolar walls.
4. (d) reduction in the secretion of surfactants by pneumocytes.

Correct answer: (b) inflammation of bronchi and bronchioles.

Solution

Wheezing is a common sign of bronchitis/asthma-like airway narrowing, which happens when the bronchi and bronchioles become inflamed. This inflammation reduces airflow and produces the characteristic whistling sound during breathing.

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