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Breathing and Exchange of Gases: Class-XI


Previous Year Questions (PYQs)

MCQ Practice


NEET PYQs on Breathing and Exchange of Gases: Class-XI


Vital capacity of lung is ________.

NEET-2023 [Breathing-and-Exchange-of-Gases] [class-xi ]

  • IRV + ERV + TV
  • IRV + ERV
  • IRV + ERV + TV + RV
  • IRV + ERV + TV – RV
  • Correct Option: A  [ IRV + ERV + TV ]

    Remark:

Under normal physiological conditions in human being every 100 ml of oxygenated blood can deliver ___________ ml of O2 to the tissues.

NEET-2022 [Breathing-and-Exchange-of-Gases] [class-xi ]

  • 5 ml
  • 4 ml
  • 10 ml
  • 2 ml
  • Correct Option: A  [ 5 ml ]

    Remark:

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

NEET-2022 [Breathing-and-Exchange-of-Gases] [class-xi ]

  • Inhaled air is humidified
  • Temperature of inhaled air is brought to body temperature
  • Provides surface for diffusion of O2 and CO2
  • It clears inhaled air from foreign particles
  • Correct Option: C  [ Provides surface for diffusion of O2 and CO2 ]

    Remark:

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

NEET-2021 [Breathing-and-Exchange-of-Gases] [class-xi ]

  • pO2 = 104 and pCO2 = 40
  • pO2 = 40 and pCO2 = 45
  • pO2 = 95 and pCO2 = 40
  • pO2 = 159 and pCO2 = 0.3
  • Correct Option: A  [ pO2 = 104 and pCO2 = 40 ]

    Remark:

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

NEET-2021 [Breathing-and-Exchange-of-Gases] [class-xi ]

  • High pO2, low pCO2, less H+, lower temperature
  • Low pO2, high pCO2, more H+, higher temperature
  • High pO2, high pCO2, less H+, higher temperature
  • Low pO2, low pCO2, more H+, higher temperature
  • Correct Option: A  [ High pO2, low pCO2, less H+, lower temperature ]

    Remark:

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

NEET-(Sept)2020 [Breathing-and-Exchange-of-Gases] [class-xi ]

  • (A) and (B)
  • (C) and (D)
  • (A), (B) and (D)
  • only (D)
  • Correct Option: A  [ (A) and (B) ]

    Remark:

Identify the wrong statement with reference to transport of oxygen.

NEET-(Sept)2020 [Breathing-and-Exchange-of-Gases] [class-xi ]

  • Binding of oxygen with haemoglobin is mainly related to partial pressure of O2.
  • Partial pressure of CO2 can interfere with O2 binding with haemoglobin.
  • Higher H+ conc. in alveoli favours the formation of oxyhaemoglobin.
  • Low pCO2 in alveoli favours the formation of oxyhaemoglobin.
  • Correct Option: C  [ Higher H+ conc. in alveoli favours the formation of oxyhaemoglobin. ]

    Remark:

The Total Lung Capacity (TLC) is the total volume of air accomodated in the lungs at the end of a forced inspiration. This includes:

NEET-(Oct)2020 [Breathing-and-Exchange-of-Gases] [class-xi ]

  • RV; IC (Inspiratory Capacity); EC (Expiratory Capacity); and ERV
  • RV; ERV; IC and EC
  • RV; ERV; VC (Vital Capacity) and FRC (Functional Residual Capacity)
  • RV (Residual Volume); ERV (Expiratory Reserve Volume); TV (Tidal Volume); and IRV (Inspiratory Reserve Volume)
  • Correct Option: D  [ RV (Residual Volume); ERV (Expiratory Reserve Volume); TV (Tidal Volume); and IRV (Inspiratory Reserve Volume) ]

    Remark:

Match the following columns and select the correct option :

Column-I Column-II
(A)Pneumotaxic Centre (I)Alveoli
(B)O2 Dissociation curve (II) Pons region of brain
(C)Carbonic Anhydrase (III)Haemoglobin
(D)Primary site of exchange of gases (IV)R.B.C.

NEET-(Oct)2020 [Breathing-and-Exchange-of-Gases] [class-xi ]

  • (A)-(I), (B)-(III), (C)-(II), (D)-(IV)
  • (A)-(II), (B)-(III), (C)-(IV), (D)-(I)
  • (A)-(III), (B)-(II), (C)-(IV), (D)-(I)
  • (A)-(IV), (B)-(I), (C)-(III), (D)-(II)
  • Correct Option: B  [ (A)-(II), (B)-(III), (C)-(IV), (D)-(I) ]

    Remark:

According to Central Pollution Control Board [CPCB] what size (in diameter) of particulate is responsible for causing greater harm to human health ?

NEET-(Oct)2020 [Breathing-and-Exchange-of-Gases] [class-xi ]

  • 3.5 micrometers
  • 2.5 micrometers
  • 4.0 micrometers
  • 3.0 micrometers
  • Correct Option: B  [ 2.5 micrometers ]

    Remark: