BrainIt

Biology

Breathing and Exchange of Gases

The human respiratory system, breathing mechanism, lung volumes and capacities, gas exchange, oxygen and CO2 transport, and respiratory disorders are all here. NEET mixes recall with numbers: volumes, capacities, partial pressures, and transport percentages.

Exam rules change between cycles. Confirm dates, syllabus and pattern against NTA's official site. We are not NTA.

Weightage: what the paper actually did

Breathing and Exchange of Gases carried 2 questions in the NEET 2026 paper. One paper is a data point, not a destiny: NTA moves weight between chapters every cycle, which is why the weightage tables deserve care. The stable facts are the paper's shape: 180 questions, 720 marks, +4 right, −1 wrong.

Sample PYQs from this chapter

Real questions NTA asked from Breathing and Exchange of Gases, with the answer and the working. Try before you peek.

Question 1 · NEET 2026

In humans, respiration occurs in the following steps. Arrange these steps in the correct order. I. Diffusion of O2 and CO2 between blood and tissues II. Diffusion of O2 and CO2 across alveolar membrane III. Pulmonary ventilation by which atmospheric air is drawn in and CO2 rich alveolar air is released out IV. Cellular respiration V. Transport of gases by the blood
  1. A.A, B, C, D, E
  2. B.E, A, C, D, B
  3. C.C, B, E, A, D
  4. D.C, A, B, E, D
Answer and explanation

Answer: C

Respiration begins with pulmonary ventilation drawing in atmospheric air and expelling CO2-rich alveolar air (C), followed by diffusion of gases across the alveolar membrane (B). Gases are then transported by the blood (E), diffuse between blood and tissues (A), and finally the cells utilise O2 in cellular respiration releasing CO2 (D). The correct order is C, B, E, A, D.

How to practise Breathing and Exchange of Gases

Chapter by chapter, against real past-paper questions, on a screen: NEET is computer based from 2027. Read the chapter once, then attempt its PYQs until your accuracy stops climbing, and let the wrong answers tell you which lines to reread. If the chapter keeps refusing to stick, that has its own guide. There is also a free 12-question mock on the exam screen.

Nearby Biology chapters

Questions

How many questions did Breathing and Exchange of Gases have in NEET 2026?

Breathing and Exchange of Gases carried 2 questions in the NEET 2026 paper. Weightage shifts between cycles, so treat it as a probability, not a promise.

Where can I practise Breathing and Exchange of Gases PYQs for NEET?

In the BrainIt app, free until the 2027 exam: its bank holds 50,000 past NTA questions tagged to all 83 chapters, including this one, with accuracy tracked per chapter. A sample question from this chapter is on this page.

Is Breathing and Exchange of Gases important for NEET 2027?

It is part of the Biology syllabus the paper draws from, and NEET 2027 is computer based, so practise it on a screen. Your own accuracy in the chapter matters more than any weightage table: a heavy chapter you already score well on needs less time than a light one you keep missing.

Something here wrong or out of date? Email [email protected] and a person will read it.