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

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

Attempt this NEET 2019 Biology question free — pick an option to reveal the correct answer and a step-by-step explanation. Then join NEET Mastery Quest to practise 15,000+ PYQ and 2027-syllabus questions.