Biology · PYQ NEET UG 2019(1)

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

1. proliferation of fibrous tissues and damage of the alveolar walls.
2. reduction in the secretion of surfactants by pneumocytes.
3. benign growth on mucous lining of nasal cavity.
4. inflammation of bronchi and bronchioles.