Breathing and Exchange of Gases is a Class 11 Biology chapter that carries about 2.0% of the Biology questions in NEET. Practise it with 48 questions covering 3 topics, each with an explanation.
Sets of 15 questions that adapt to your level, with an explanation for every answer.
Across the 13 previous year papers, Breathing and Exchange of Gases had 22 questions, about 1.7 a year. The most in one paper was 3, in NEET 2018.
| Paper | Questions from this chapter |
|---|---|
| NEET 2026 | 3 |
| NEET 2025 | 0 |
| NEET 2024 | 2 |
| NEET 2023 | 1 |
| NEET 2022 | 1 |
| NEET 2021 | 3 |
| NEET 2020 | 2 |
| NEET 2019 | 2 |
| NEET 2018 | 3 |
| NEET 2017 | 1 |
| NEET 2016 | 2 |
| Re-AIPMT 2015 | 1 |
| AIPMT 2014 | 1 |
8 questions from the practice bank, spread across the chapter's topics. The full set is in the app.
The enzyme which facilitates the reaction of the CO₂ with the water to form carbonic acid in the RBCs is:
Answer: B. carbonic anhydrase
Why: The reaction is reversible.
Inspiration occurs when the pressure within the lungs (intra-pulmonary pressure) is:
Answer: A. less than the atmospheric pressure
Why: There is a negative pressure in the lungs.
Most carbon dioxide transported in the blood from tissues to the lungs is carried as:
Answer: B. bicarbonate ions
Why: About 70% of CO2 is transported as bicarbonate ion after combining with water in RBCs (catalysed by carbonic anhydrase), with smaller fractions carried as carbaminohaemoglobin and dissolved gas.
About what percentage of the CO₂ is transported as the bicarbonate?
Answer: C. 70%
Why: About 20–25% is carried as the carbamino-haemoglobin.
The volume of air inspired or expired during a normal quiet breath (tidal volume) is about:
Answer: C. 500 mL
Why: Normal breathing at about 12 times a minute moves around 6–8 litres per minute.
Emphysema is a respiratory disorder in which:
Answer: D. the alveolar walls are damaged, reducing the surface area for gas exchange
Why: Cigarette smoking is a major cause.
About what percentage of the oxygen is transported by the RBCs in the blood?
Answer: B. 97%
Why: The remaining 3% is carried in the dissolved state through the plasma.
The respiration in the fishes is by:
Answer: B. the gills
Why: The aquatic arthropods also use the gills.
Breathing and Exchange of Gases carries about 2.0% of the Biology questions in NEET. Across the 13 previous year papers on NeetVictory it appeared 22 times, about 1.7 questions a year.
Breathing and Exchange of Gases is a Class 11 Biology chapter in the NCERT syllabus.
NeetVictory has 48 practice questions on Breathing and Exchange of Gases, each with an explanation, in sets of 15 that adapt to your level. This page shows a free sample.
NeetVictory