Biology · chapter PYQs

Breathing and Exchange of Gases, on the exam screen.

5 questions from NEET 2026, Re-NEET 2026, NEET 2020, 5 minutes, marked +4 / −1. See them with solutions.

Breathing and Exchange of Gases · PYQs

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Question 1 · NEET 2026 · Q138 · +4 / −1
In humans, respiration occurs in the following steps. Arrange these steps in the correct order.

Statement I: Diffusion of $\mathrm{O}_{2}$ and $\mathrm{CO}_{2}$ between blood and tissues
Statement II: Diffusion of $\mathrm{O}_{2}$ and $\mathrm{CO}_{2}$ across alveolar membrane
Statement III: Pulmonary ventilation by which atmospheric air is drawn in and $\mathrm{CO}_{2}$ rich alveolar air is released out
Statement IV: Cellular respiration
Statement V: Transport of gases by the blood
Answer and explanation
Answer: (3)
Respiration begins with pulmonary ventilation drawing in atmospheric air and expelling $\mathrm{CO}_{2}$ -rich alveolar air (Statement III), followed by diffusion of gases across the alveolar membrane (Statement II). Gases are then transported by the blood (Statement V), diffuse between blood and tissues (Statement I), and finally the cells utilise $\mathrm{O}_{2}$ in cellular respiration releasing $\mathrm{CO}_{2}$ (Statement IV). The correct order is III, II, V, I, IV.

Question 2 · NEET 2026 · Q144 · +4 / −1

Match List-I with List-II.

List I (Respiratory Volume)	List II (Capacity in mL)
P) ERV (Expiratory Reserve Volume)	I) 2500 - 3000 mL
Q) RV (Residual Volume)	II) 500 mL
R) IRV (Inspiratory Reserve Volume)	III) 1000 - 1100 mL
S) TV (Tidal Volume)	IV) 1100 - 1200 mL

Choose the correct answer from the options given below :

Answer and explanation

Answer: (1)

Standard respiratory values: Expiratory Reserve Volume (ERV) is about 1000-1100 mL (III), Residual Volume (RV) is about 1100-1200 mL (IV), Inspiratory Reserve Volume (IRV) is about 2500-3000 mL (I), and Tidal Volume (TV) is about 500 mL (II). Hence P-III, Q-IV, R-I, S-II.

Question 3 · Re-NEET 2026 · Q150 · +4 / −1
Sponges exchange $\mathrm{O}_{2}$ with $\mathrm{CO}_{2}$ by __________.
Answer and explanation
Answer: (1)
Lower invertebrates such as sponges, coelenterates and flatworms have no specialised respiratory organs at all. Their bodies are thin enough and their cells close enough to the surrounding water that simple DIFFUSION across the whole body surface suffices for gas exchange. NCERT Class 11, Breathing and Exchange of Gases.
Question 4 · NEET 2020 · Q14 · +4 / −1
Select the correct events that occur during inspiration.

Statement I: Contraction of diaphragm
Statement II: Contraction of external inter-costal muscles
Statement III: Pulmonary volume decreases
Statement IV: Intra pulmonary pressure increases
Answer and explanation
Answer: (4)
Inspiration requires contraction of the diaphragm and external intercostal muscles. Thoracic and pulmonary volume increase while intrapulmonary pressure falls, so only statements (I) and (II) are correct. Chapter: Breathing and Exchange of Gases.
Question 5 · NEET 2020 · Q86 · +4 / −1
Identify the wrong statement with reference to transport of oxygen.
Answer and explanation
Answer: (2)
Higher $\mathrm{H}^{+}$ concentration in the alveoli does not favour the formation of oxyhaemoglobin; instead, it promotes the release of $\mathrm{O}_{2}$ from haemoglobin. Chapter: Breathing and Exchange of Gases.