Questions
13
across 8 papers
Share of subject
3.4%
of 388 Zoology Qs
Weightage rank
#14
of 16 chapters
Difficulty
2 easy · 9 medium · 2 hard
Breathing and Exchange of Gases contributed 13 of the 388 NEET Zoology questions between 2020 and 2026 (Re-NEET 2026 included). That is 3.4% of the subject and makes it the #14 chapter out of 16 by weightage — roughly 1.6 questions per paper, peaking at 3 in NEET 2021.
Of the 13 questions tagged for difficulty, 15% were easy, 70% medium and 15% hard — mostly medium-level questions that reward practice beyond one-line facts.
It has been asked less often lately: 1 question per paper across NEET 2025, NEET 2026 and Re-NEET 2026, against 2.3 in 2020–2022.
The single most-tested topic is Transport of Gases (O₂ and CO₂) (Transport of Oxygen) — 3 questions across 3 papers.
9 topics tagged under Breathing and Exchange of Gases. Numbers show how many questions each topic had in each paper; E / M / H are the easy, medium and hard counts.
| Topic | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 | Re | Total | E | M | H |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Exchange of Gases (O₂ and CO₂) (Atm pO₂ and pCO₂, Alveoli, etc.) | – | 2 | 1 | – | – | – | – | – | 3 | – | 3 | – |
| Transport of Gases (O₂ and CO₂) (Transport of Oxygen) | 1 | – | – | – | 1 | – | 1 | – | 3 | 2 | – | 1 |
| Disorders of Respiratory System | – | 1 | – | – | – | – | – | – | 1 | – | 1 | – |
| Human Respiratory System | – | – | 1 | – | – | – | – | – | 1 | – | 1 | – |
| Mechanism of Breathing (Inspiration and its Associated Muscle) | 1 | – | – | – | – | – | – | – | 1 | – | 1 | – |
| Respiratory Capacities (Vital Capacity) | – | – | – | – | 1 | – | – | – | 1 | – | 1 | – |
| Respiratory Organs (Gills, Trachea, etc.) | – | – | – | – | – | – | 1 | – | 1 | – | 1 | – |
| Respiratory Volume (Expiratory Reserve Volume) | – | – | – | – | – | – | 1 | – | 1 | – | 1 | – |
| Respiratory Volumes and Capacities (TV, IRV, etc.) | – | – | – | 1 | – | – | – | – | 1 | – | – | 1 |
In the NEET papers from 2020 to 2026 (including Re-NEET 2026), 13 Zoology questions came from Breathing and Exchange of Gases — 3.4% of the subject, or about 1.6 per paper.
By past weightage it ranks #14 of 16 Zoology chapters, so it is a lower-weightage Zoology chapter, with 13 questions over 2020–2026.
The most-tested topics are Transport of Gases (O₂ and CO₂) (Transport of Oxygen) (3), Exchange of Gases (O₂ and CO₂) (Atm pO₂ and pCO₂, Alveoli, etc.) (3) and Disorders of Respiratory System (1). The topic table above lists every topic with its count in each paper.
Of the 13 difficulty-tagged questions, 15% were easy, 70% medium and 15% hard.
Transport of Gases (O₂ and CO₂) (Transport of Oxygen), Respiratory Organs (Gills, Trachea, etc.) and Respiratory Volume (Expiratory Reserve Volume) were asked in the 2026 papers.
Edurack has chapter-wise NEET previous-year questions for Breathing and Exchange of Gases. Use the practice button on this page to open the set, attempt questions and check your answers.
Counts come from Edurack's tagged set of NEET papers 2020–2026 (including Re-NEET 2026), mapped to NCERT chapters and topics. Use them as a trend guide — past frequency doesn't guarantee what a future paper will ask.