276
MCQ Questions
40
Assertion-Reason
64
NEET 2025 Pattern
20
Previous Year Q
NCERT Mapping
Breathing and Gaseous Exchange is from NCERT Class 11 Biology, Chapter 14, under the unit Human Physiology. This chapter carries approximately 3% weightage in NEET, based on analysis of the last 10 years of question papers. MedicNEET covers this chapter with 380 questions — every question built from line-by-line NCERT analysis.
Topics in Breathing and Gaseous Exchange
Mechanism of breathing
Transport of gases
Respiratory organs
Regulation of respiration, disperse of respiratory system
Exchange of gases
Sample Questions — Breathing and Gaseous Exchange
Try 5 free questions below. Get all 380 in the MedicNEET app.
MCQ
An athlete uses ethephon (releases ethylene in plants) to train in hypoxic chambers simulating high altitude. Which physiological changes are expected in him?
✅ Correct Answer: D
Hypoxia decreases O₂ uptake (14.3–14.4), lowering oxyhaemoglobin, stimulating rhythm regulation (14.5).
MCQ
A patient shows reduced total lung capacity (TLC). Which of the following lung volumes is most likely decreased?
✅ Correct Answer: D
Total lung capacity = VC + RV. A reduction in TLC usually suggests lower residual volume or obstructive pathology affecting air retention.
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MCQ
Identify the INCORRECT pair:
✅ Correct Answer: C
Pleural fluid reduces friction on the lung surface during breathing.
Assertion-Reason
Assertion (A): Carbon dioxide diffuses more readily through respiratory membranes than oxygen.
Reason (R): Oxygen has 20-25 times higher solubility than carbon dioxide in blood.
✅ Correct Answer: C
NCERT confirms “the amount of CO2 that can diffuse through the diffusion membrane per unit difference in partial pressure is much higher compared to that of O2” - Assertion is true. However, NCERT states “As the solubility of CO2 is 20-25 times higher than that of O2” - Reason reverses the solubility relationship, making it false.
NEET 2025 Pattern
Arrange the following structures in the correct sequence of airflow during inspiration in the human respiratory system:
(i) Secondary bronchi
(ii) Larynx
(iii) Nasal chamber
(iv) Alveoli
(v) Pharynx
(vi) Terminal bronchioles
(vii) Trachea
✅ Correct Answer: A
The correct sequence of airflow during inspiration in the human respiratory system, as described in NCERT, is as follows:
Atmospheric air enters through external nostrils,
1. Nasal chamber (iii)
2. Pharynx (v)
3. Larynx (ii)
4. Trachea (vii)
5. Primary bronchi (which then divide into secondary bronchi (i))
6. Secondary and tertiary bronchi, followed by bronchioles, and then terminal bronchioles (vi)
7. Alveoli (iv)
Thus, the correct sequence is Nasal chamber → Pharynx → Larynx → Trachea → Secondary bronchi → Terminal bronchioles → Alveoli.
Therefore, option A represents the correct sequence.
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Frequently Asked Questions
How many Breathing and Gaseous Exchange questions does MedicNEET have?
MedicNEET has 380 questions for Breathing and Gaseous Exchange, including 276 MCQs, 40 Assertion-Reason questions, and 64 NEET 2025-style long-form questions.
What is the NEET weightage of Breathing and Gaseous Exchange?
Breathing and Gaseous Exchange carries approximately 3% weightage in NEET, based on analysis of the last 10 years of papers. It falls under the Human Physiology unit of Class 11 Biology.
Are Breathing and Gaseous Exchange questions NCERT-based?
Yes, all MedicNEET Breathing and Gaseous Exchange questions are built from line-by-line analysis of NCERT Class 11 textbook. Every question maps to specific NCERT pages and concepts.