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Class XI · Biology

Breathing and Exchange of Gases: NEET MCQ practice

271 practice questions on Breathing and Exchange of Gases, including 23 from past NEET papers, each with an explanation. Practise them chapter by chapter in the GyaanLoop app.

271

Practice questions

181

Easy

88

Medium

2

Hard

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What Breathing and Exchange of Gases covers

Topics in the NEET (UG) 2026–27 syllabus for this chapter.

  • Respiratory organs in animals (recall only); respiratory system in humans
  • Mechanism of breathing and its regulation; exchange and transport of gases
  • Disorders related to respiration- asthma, emphysema, occupational respiratory disorders

Past NEET questions on Breathing and Exchange of Gases

Try each one, then open the answer and explanation.

Question 1 · NEET 2025

Frogs respire in water by skin and buccal cavity and on land by skin, buccal cavity and lungs. Choose the correct answer from the following :

  1. A.The statement is true for water but false for land
  2. B.The statement is true for both the environment
  3. C.The statement is false for water but true for land
  4. D.The statement is false for both the environment
Show answer

Answer: B. The statement is true for both the environment

Frogs respire through skin and buccal cavity in water. On land, skin, buccal cavity, and lungs are all used. The statement matches both conditions exactly.

Question 2 · NEET 2024

Match List-I with List-II: List-I List-II A. Residual Volume I. Maximum volume of air that can be breathed in after forced expiration B. Vital Capacity II. Volume of air inspired or expired during normal respiration C. Expiratory Capacity III. Volume of air remaining in lungs after forcible expiration D. Tidal Volume IV. Total volume of air expired after normal inspiration Choose the correct answer from the options given below:

  1. A.A-IV, B-III, C-II, D-I
  2. B.A-II, B-IV, C-I, D-III
  3. C.A-III, B-I, C-IV, D-II
  4. D.A-I, B-II, C-III, D-IV
Show answer

Answer: C. A-III, B-I, C-IV, D-II

Residual Volume is air remaining after forcible expiration → III. Vital Capacity is maximum air after forced expiration → I. Expiratory Capacity is total air expired after normal inspiration → IV. Tidal Volume is air moved in normal respiration → II.

Question 3 · NEET 2024

Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R. Assertion A: During the transportation of gases, about 20 −25 percent of CO2 is carried by Haemoglobin as carbamino-haemoglobin. Reason R: This binding is related to high pCO2 and low pO2 in tissues. In the light of the above statements, choose the correct answer from the options given below.

  1. A.𝐴 is true but 𝑅 is false.
  2. B.A is false but 𝑅 is true.
  3. C.Both 𝐴 and 𝑅 are true and 𝑅 is the correct explanation of 𝐴.
  4. D.Both A and R are true but R is NOT the correct explanation of A.
Show answer

Answer: C. Both 𝐴 and 𝑅 are true and 𝑅 is the correct explanation of 𝐴.

First check Assertion A: The amount of CO₂ transported as carbamino‑haemoglobin is about 20–25% (textbook value ≈ 20–25%). A is true. Reason R: Binding of CO₂ to Hb is indeed favored by high pCO₂ and low pO₂ in tissues (Haldane effect). R is also true and correctly explains why this form of transport occurs in tissues. So R explains A.

Question 4 · NEET 2022

Which of the following is not the function of conducting part of respiratory system?

  1. A.It clears inhaled air from foreign particles
  2. B.Inhaled air is humidified
  3. C.Temperature of inhaled air is brought to body temperature
  4. D.Provides surface for diffusion of O2 and CO2
Show answer

Answer: D. Provides surface for diffusion of O2 and CO2

The conducting zone includes nasal cavity, pharynx, trachea, bronchi, bronchioles. Functions: filter, humidify, warm air. The respiratory zone (alveoli) is where gas exchange occurs, so (D) is not a conducting part function.

Question 5 · NEET 2022

Which of the following disorders represents decrease in respiratory surface due to damaged alveolar walls?

  1. A.bronchitis
  2. B.Asthma
  3. C.Emphysema
  4. D.Hypocapnia Ans.
Show answer

Answer: C. Emphysema

The alveolar walls break down in emphysema, reducing the total respiratory surface area. Bronchitis and asthma involve airway obstruction/inflammation, not primarily alveolar damage. Hypocapnia is low CO2, not a lung disorder.

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