Here are 20 NCERT based MCQ for NEET 2024 from Class 11 chapter- Breathing and Exchange of Gases. Attempt these 20 important biology MCQs for NEET preparation.
1. Which of the following structures is not supported by incomplete cartilaginous rings?
(1) Trachea
(2) Secondary bronchi
(3) Terminal bronchioles
(4) Primary bronchi
2. Trachea is a straight tube extending up to the mid-thoracic cavity, which divides at the level of
(1) 2nd cervical vertebra
(2) 5th cervical vertebra
(3) 5th thoracic vertebra
(4) 5th lumbar vertebra
3. Outer pleural membrane is in close contact with
(1) Surface of lungs
(2) Thoracic lining
(3) Both (1) & (2)
(4) Alveoli
4. The volume of air remaining in the lungs even after a forcible expiration is
(1) Expiratory reserve volume
(2) Expiratory capacity
(3) Residual volume
(4) Both (1) & (2)
5. The maximum volume of air a person can breathe in after a forced expiration is
(1) Vital capacity
(2) ERV + TV + IRV
(3) TLC-RV
(4) All of these
6. Which of the following statements is incorrect w.r.t. mechanism of breathing?
(1) Movement of air into and out of the lungs is carried out by creating a pressure gradient between the lungs and the atmosphere
(2) Inspiration is initiated by contraction of diaphragm which increases the volume of thoracic chamber
(3) The contraction of external intercostal muscles lifts up the ribs and the sternum causing decrease in the volume of thoracic chamber
(4) On an average, a healthy human breathes 12-16 times/minute.
7. In mammals ventilation movements of lungs are governed by
(1) Muscular wall of lungs
(2) Intercostal muscles
(3) Diaphragm
(4) Diaphragm and intercostal muscles
8. What will be the pO2 and pCO₂ in the atmospheric air as compared to those in the alveolar air?
(1) pO₂, lesser, pO₂ higher
(2) pO₂ higher, pCO₂ lesser
(3) PO₂ higher, pCO2 higher
(4) PO₂ lesser, pCO₂ lesser
9. What is the partial pressure of oxygen and carbon dioxide in atmospheric air?
(1) pO₂ 159 mm Hg, pCO2 0.3 mm Hg
(2) pO2 104 mm Hg, pCO2 40 mm Hg
(3) pO₂ 40 mm Hg, pCO2 45 mm Hg
(4) pO2 95 mm Hg, pCO2 40 mm Hg
10. Diffusion membrane is made up of which of the following layers?
(1) Thin squamous epithelium of alveoli
(2) Basement membrane
(3) Endothelium of alveolar capillaries
(4) All of these
11. Which of the following statements is incorrect about transport of gases?
(1) About 97 percent of O₂, is transported by RBCs in the blood
(2) 3 percent of O₂ is carried in dissolved state in the plasma
(3) 20-25 percent of CO₂ is transported by RBCs in the form of carbaminohaemoglobin
(4)70 percent carbon dioxide is carried in dissolved state in plasma
12.Binding of oxygen with haemoglobin is primarily related to which of the following factors?
(1) Partial pressure of CO₂
(2) Partial pressure of O2
(3) Hydrogen ion concentration
(4) Temperature
13.Which of the following factor/s are favorable for the formation of oxyhaemoglobin?
(A) High pO₂, low pCO2
(B) Lesser H+ concentration, lower temperature
(C) Low pO₂, high CO₂
(D) High H+, higher temperature
(1) (A) only
(2) (A) and (B)
(3) (B) and (C)
(4) (C) and (D)
14. Tick mark the incorrect statement
(1) Every 100 ml of deoxygenated blood delivers approximately 4 ml of CO₂ to the alveoli
(2) Carbonic anhydrase is present in very high concentration in RBC
(3) High pCO2, and low pO2, in tissues help in binding of carbon dioxide
(4) CO₂ is carried in haemoglobin as carboxyhaemoglobin
15. In which of the following disorders there is difficulty in breathing causing wheezing due to inflammation of bronchi and bronchioles?
(1) Emphysema
(2) Asthma
(3) Pleurisy
(4) Tuberculosis
16. Where is the respiratory rhythm centre present that has significant ability to maintain the respiratory rhythm to suit the demands of the body tissues?
(1) Cerebrum
(2) Medulla
(3) Pons
(4) Cerebellum
17. Which of the following is a chronic respiratory disorder in which alveolar walls are damaged due to which respiratory surface is decreased? One of the major causes of this disease is cigarette smoking
(1) Asthma
(2) Emphysema
(3) Silicosis
(4) Pneumonia
18. Pneumotaxic centre can moderate the functions of the respiratory rhythm centre. It is present in
(1) Medulla
(2) Cerebrum
(3) Pons
(4) Cerebellum
19. Which of the following can activate the chemosensitive area situated adjacent to the rhythm centre?
(1) High CO₂ concentration, less hydrogen ion concentration
(2) High CO₂, and high hydrogen ion concentration
(3) Less CO₂, high H+ ion concentration
(4) Less CO₂, less H+ ion concentration
20. Which of the following are incorrect?
(1) Tidal volume= 500mL
(2) Residual volume= 1100mL to 1200mL
(3) Functional residual capacity= ERV+RV
(4) None