Breathing and Exchange of Gases MCQ practice test for NEET Biology, based on NEET syllabus Unit 5 (Human Physiology) and NCERT Class XI. Each set has 15 NEET-pattern MCQs in 15 minutes. Questions cover respiratory organs in animals, the human respiratory system, the mechanism of breathing, respiratory volumes and capacities, exchange of gases and partial pressures, transport of oxygen and carbon dioxide, the oxygen dissociation curve, regulation of respiration, and disorders such as asthma, emphysema and occupational respiratory disorders. Previous-year NEET questions are mixed with new questions.