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