NEET Breathing and Exchange of Gases PYQ practice sheet

11 previous-year NEET Zoology questions from Breathing and Exchange of Gases, newest papers first. Breathing and Exchange of Gases carries 13 of the Zoology questions in NEET 2020 to 2026, so this is a good place to test yourself after revising the chapter. Marking: +4 correct, −1 wrong.

1. 1.

   RE-NEET 2026

   Sponges exchange $O_2$ with $CO_2$ by __________.

   • (A)
     gills
   • (B)
     tracheal tubes
   • (C)
     moist cuticle
   • (D)
     simple diffusion over their entire body surfaces
2. 2.

   NEET 2026

   In humans, respiration occurs in the following steps. Arrange these steps in the correct order. A. Diffusion of $\mathrm{O_2}$ and $\mathrm{CO_2}$ between blood and tissues B. Diffusion of $\mathrm{O_2}$ and $\mathrm{CO_2}$ across alveolar membrane C. Pulmonary ventilation by which atmospheric air is drawn in and $\mathrm{CO_2}$ rich alveolar air is released out D. Cellular respiration E. Transport of gases by the blood Choose the correct answer from the options given below:

   • (A)
     E, A, C, D, B
   • (B)
     C, A, B, E, D
   • (C)
     C, B, E, A, D
   • (D)
     A, B, C, D, E
3. 3.

   NEET 2026

   Match List-I with List-II. List-I (Respiratory Volume): A. ERV (Expiratory Reserve Volume), B. RV (Residual Volume), C. IRV (Inspiratory Reserve Volume), D. TV (Tidal Volume) List-II (Capacity in mL): I. 2500 - 3000 mL, II. 500 mL, III. 1000 - 1100 mL, IV. 1100 - 1200 mL Choose the correct answer from the options given below:

   • (A)
     A-III, B-I, C-IV, D-II
   • (B)
     A-III, B-IV, C-I, D-II
   • (C)
     A-I, B-III, C-II, D-IV
   • (D)
     A-I, B-II, C-III, D-IV
4. 4.

   NEET 2026

   Match List I with List II: List I: A. Molluscs, B. Reptiles, C. Adult amphibians, D. Amoeba List II: I. Pulmonary respiration only, II. Branchial respiration, III. Cellular respiration, IV. Pulmonary and cutaneous respiration Choose the correct answer from the options given below:

   • (A)
     A-II, B-I, C-III, D-IV
   • (B)
     A-I, B-II, C-IV, D-III
   • (C)
     A-II, B-I, C-IV, D-III
   • (D)
     A-III, B-II, C-I, D-IV
5. 5.

   NEET 2024

   Match List I with List II: List I: A. Expiratory capacity, B. Functional residual capacity, C. Vital capacity, D. Inspiratory capacity List II: I. Expiratory reserve volume + Tidal volume + Inspiratory reserve volume, II. Tidal volume + Expiratory reserve volume, III. Tidal volume + Inspiratory reserve volume, IV. Expiratory reserve volume + Residual volume Choose the correct answer from the options given below:

   • (A)
     A-II, B-IV, C-I, D-III
   • (B)
     A-II, B-I, C-IV, D-III
   • (C)
     A-III, B-II, C-IV, D-I
   • (D)
     A-I, B-III, C-II, D-IV
6. 6.

   NEET 2024

   Which of the following factors are favourable for the formation of oxyhaemoglobin in alveoli?

   • (A)
     Low pCO$_2$ and High H$^+$ concentration
   • (B)
     High pO$_2$ and High pCO$_2$
   • (C)
     High pO$_2$ and Lesser H$^+$ concentration
   • (D)
     Low pCO$_2$ and High temperature
7. 7.

   NEET 2022

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

   • (A)
     Provides surface for diffusion of $\mathrm{O_2}$ and $\mathrm{CO_2}$
   • (B)
     It clears inhaled air of foreign particles
   • (C)
     Inhaled air is humidified
   • (D)
     Temperature of inhaled air is brought to body temperature
8. 8.

   NEET 2021

   The partial pressures (in mm Hg) of oxygen (O2) and carbon dioxide (CO2) at alveoli (the site of diffusion) are :

   • (A)
     pO2 = 40 and pCO2 = 45
   • (B)
     pO2 = 104 and pCO2 = 40
   • (C)
     pO2 = 95 and pCO2 = 40
   • (D)
     pO2 = 159 and pCO2 = 0.3
9. 9.

   NEET 2021

   Select the favourable conditions required for the formation of oxyhaemoglobin at the alveoli.

   • (A)
     High pO2, low pCO2, less H⁺, lower temperature
   • (B)
     High pO2, high pCO2, less H⁺, higher temperature
   • (C)
     Low pO2, low pCO2, more H⁺, higher temperature
   • (D)
     Low pO2, high pCO2, more H⁺, higher temperature
10. 10.

    NEET 2020

    Identify the wrong statement with reference to transport of oxygen.

    • (A)
      Binding of oxygen with haemoglobin is mainly related to partial pressure of $\mathrm{O_2}$.
    • (B)
      Partial pressure of $\mathrm{CO_2}$ can interfere with $\mathrm{O_2}$ binding with haemoglobin.
    • (C)
      Higher $\mathrm{H^+}$ conc. in alveoli favours the formation of oxyhaemoglobin.
    • (D)
      Low $\mathrm{pCO_2}$ in alveoli favours the formation of oxyhaemoglobin.
11. 11.

    NEET 2020

    Select the correct events that occur during inspiration. (a) Contraction of diaphragm (b) Contraction of external inter-costal muscles (c) Pulmonary volume decreases (d) Intra pulmonary pressure increases

    • (A)
      (a) and (b)
    • (B)
      (c) and (d)
    • (C)
      (a), (b) and (d)
    • (D)
      only (d)