NCERT CLASS 11 | TOPIC : BREATHING AND EXCHANGE OF GASES | PYQB | NEET BIOLOGY ONLINE TEST

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NCERT CLASS 11 | TOPIC : BREATHING AND EXCHANGE OF GASES | PYQB | NEET BIOLOGY ONLINE TEST

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It contains 52 important questions. Choose the most correct answer. Then check your answer. Try again if there are errors. Regards : kalvisolai.net

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1 ➤ 1. Which of the following is not the function of conducting part of respiratory system? (2022)

(a) It clears inhaled air from foreign particles (b) Inhaled air is humidified (c) Temperature of inhaled air is brought to body temperature (d) Provides surface for diffusion of O₂ and CO₂

2 ➤ 2. The figure shows a diagrammatic view of human respiratory system with labels A, B, C and D. Select the option which gives correct identification and main function and/or characteristic. (2013)

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(a) C - Alveoli Thin walled vascular bag like structures for exchange of gases. (b) D - Lower end of lungs Diaphragm pulls it down during inspiration. (c) A - Trachea Long tube supported by complete cartilaginous rings for conducting inspired air. (d) B - Pleural membrane Surround ribs on both sides to provide cushion against rubbing.

3 ➤ 3. Lungs are enclosed in (1996)

(a) periosteum (b) perichondrium (c) pericardium (d) pleural membrane.

4 ➤ 4. Skin is an accessory organ of respiration in (1990)

(a) humans (b) frog (c) rabbit (d) lizard.

5 ➤ 5. Vital capacity of lung is (2023)

(a) IRV + RV + TV-RV (b) IRV + RV + TV (c) IRV + ERV (d) IRV + RV + TV + RV

6 ➤ 6. Select the correct events that occur during inspiration.

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(1) Contraction of diaphragm

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(2) Contraction of external inter-costal muscles

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(3) Pulmonary volume decreases

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(4) Intra pulmonary pressure increases (2020)

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(a) (1) and (2) (b) (3) and (4) (c) (1), (2) and (4) (d) only (4)

7 ➤ 7. Tidal volume and expiratory reserve volume of an athlete is 500 mL and 1000 mL respectively. What will be his expiratory capacity if the residual volume is 1200 mL? (2019)

(a) 2700 mL (b) 1500 mL (c) 1700 mL (d) 2200 mL

8 ➤ 8. Select the correct statement. (Odisha NEET 2019)

(a) Expiration occurs due to external intercostal muscles. (b) Intrapulmonary pressure is lower than the atmospheric pressure during inspiration. (c) Inspiration occurs when atmospheric pressure is less than intrapulmonary pressure. (d) Expiration is initiated due to contraction of diaphragm.

9 ➤ 9. Match the items given in column I with those in column II (2018)

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(A) Tidal volume - (i) 2500-3000 mL

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(B) Inspiratory reserve volume - (ii) 1100-1200 ml.

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(C) Expiratory reserve volume - (iii) 500-550 ml.

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(D) Residual volume - (iv) 1000 - 1100 ml.

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(a) (A)-(iii) (B)-(ii) (C)-(i) (D)-(iv) (b) (A)-(iii) (B)-(i) (C)-(iv) (D)-(ii) (c) (A)-(i) (B)-(iv) (C)-(ii) (D)-(iii) (d) (A)-(iv) (B)-(iii) (C)-(ii) (D)-(i)

10 ➤ 10. Lungs are made up of air-filled sacs, the alveoli. They do not collapse even after forceful expiration, because of (2017)

(a) inspiratory reserve volume (b) tidal volume (c) expiratory reserve volume (d) residual volume.

11 ➤ 11. Lungs do not collapse between breaths and some air always remains in the lungs which can never be expelled because (NEET-II 2016)

(a) there is a negative pressure in the lungs (b) there is a negative intrapleural pressure pulling at the lung walls (c) there is a positive intrapleural pressure (d) pressure in the lungs is higher than the atmospheric pressure.

12 ➤ 12. Which one of the following is a possibility for most of us in regard to breathing, by making a conscious effort? (Mains 2011)

(a) One can breathe out air totally without oxygen. (b) One can breathe out air through Eustachian tube by closing both nose and mouth. (c) One can consciously breathe in and breathe out by moving the diaphragm alone, without moving the ribs at all. (d) The lungs can be made fully empty by forcefully breathing out all air from them.

13 ➤ 13. Listed below are four respiratory capacities (i-iv) and four jumbled respiratory volumes of a normal human adult.

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(i) Residual volume - 2500 mL

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(ii) Vital capacity - 3500 mL

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(iii) Inspiratory reserve volume - 1200 mL

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(iv) Inspiratory capacity - 4500 mL

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Which one of the following is the correct matching of two capacities and volumes?(2010)

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(a) (ii) 2500 ml, (iii) 4500 mL (b) (iii) 1200 ml, (iv) 2500 mL (c) (iv) 3500 ml., (i) 1200 ml. (d) (i) 4500 ml, (ii) 3500 ml.

14 ➤ 14. What is vital capacity of our lungs? (2009)

( a) Inspiratory reserve volume plus expiratory reserve volume (b) Total lung capacity minus residual volume (c) Inspiratory reserve volume plus tidal volume (d) Total lung capacity minus expiratory reserve volume

15 ➤ 15. Which one of the following statements is incorrect? (2006)

(a) The principle of countercurrent flow facilitates efficient respiration in gills of fishes. (b) The residual air in lungs slightly decreases the efficiency of respiration in mammals. (c) The presence of non-respiratory air sacs, increases the efficiency of respiration in birds. (d) In insects, circulating body fluids serve to distribute oxygen to tissues.

16 ➤ 16. When 1500 ml air is in the lungs, it is called (1996)

(a) residual volume (b) inspiratory reserve volume (c) vital capacity (d) tidal volume.

17 ➤ 17. The ventilation movements of the lungs in mammals are governed by (1995)

(a) muscular walls of lung (b) diaphragm (c) intercostal muscles (d) both (b) and (c).

18 ➤ 18. In man and mammals, air passes from outside into the lungs through (1994)

(a) nasal cavity, larynx, pharynx, trachea, bronchi, alveoli (b) nasal cavity, larynx, pharynx, trachea, bronchioles, alveoli (c) nasal cavity, pharynx, larynx, trachea, bronchioles, bronchi, alveoli (d) nasal cavity, pharynx, larynx, trachea, bronchi, bronchioles, alveoli.

19 ➤ 19. The partial pressures (in mm Hg) of oxygen (O₂) and carbon dioxide (CO₂) at alveoli (the site of diffusion) are (2021)

(a) pO₂ = 159 and pCO₂ = 0.3 (b) pO₂= 104 and pCO₂ = 40 (c) pO₂ = 40 and pCO₂ = 45 (d) pO₂ = 95 and pCO₂ = 40

20 ➤ 20. The partial pressure of oxygen in the alveoli of the lungs is (NEET-II 2016)

(a) equal to that in the blood (b) more than that in the blood (c) less than that in the blood (d) less than that of carbon dioxide.

21 ➤ 21. The figure given below shows a small part of human lung where exchange of gases takes place. Select the option which represents labelled part (A, B, C or D) correctly identified along with its function.(2011)

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(a) C: Arterial capillary - Passes oxygen to tissues (b) A: Alveolar cavity respiratory gases Main site of exchange of (c) D: Capillary wall takes place here Exchange of O₂ and CO: (d) B: Red blood cells mainly Transport of CO₂

22 ➤ 22. The exchange of gases in the alveoli of the lungs takes place by (1998)

(a) passive transport (c) osmosis (b) active transport (d) simple diffusion.

23 ➤ 23. In lungs, the air is separated from the venous blood through (1997)

(a) transitional epithelium + tunica externa of blood vessel (b) squamous epithelium + endothelium of blood vessel (c) squamous epithelium + tunica media of blood vessel (d) none of the above.

24 ➤ 24. The alveolar epithelium in the lung is (1990)

(a) non-ciliated columnar (b) non-ciliated squamous (c) ciliated columnar (d) ciliated squamous.

25 ➤ 25. Under normal physiological conditions in human being every 100 ml of oxygenated blood can deliver ml of O, to the tissues. (2022)

(a) 2 ml (b) 5 ml (c) 4 ml (d) 10 ml

26 ➤ 26. Select the favourable conditions required for the formation of oxyhaemoglobin at the alveoli. (2021)

(a) Low pO₂, low pCO₂, more H+, higher temperature (b) High pO₂, low pCO₂, less H+, lower temperature (c) Low pO₂, high pCO₂, more H+, higher temperature (d) High pO₂, high pCO₂, less H+, higher temperature

27 ➤ 27. Identify the wrong statement with reference to transport of oxygen. (2020)

(a) Binding of oxygen with haemoglobin is mainly related to partial pressure of O₂. (b) Partial pressure of CO, can interfere with O₂ binding with haemoglobin. (c) Higher H¹ conc. in alveoli favours the formation of oxyhaemoglobin. (d) Low pCO₂ in alveoli favours the formation of oxyhaemoglobin.

28 ➤ 28. Reduction in pH of blood will (NEET-1 2016)

(a) decrease the affinity of haemoglobin with oxygen (b) release bicarbonate ions by the liver (c) reduce the rate of heartbeat (d) reduce the blood supply to the brain.

29 ➤ 29. Approximately seventy percent of carbon dioxide absorbed by the blood will be transported to the lungs (2014)

(a) as bicarbonate ions (b) in the form of dissolved gas molecules (c) by binding to RBC (d) as carbamino - haemoglobin.

30 ➤ 30. A large proportion of oxygen remains unused in the human blood even after its uptake by the body tissues. This O₂

(a) acts as a reserve during muscular exercise (b) raises the pCO₂ of blood to 75 mm of Hg (c) is enough to keep oxyhaemoglobin saturation at 96% (d) helps in releasing more O₂ to the epithelial tissues.

31 ➤ 31. Bulk of carbon dioxide (CO₂) released from body tissues into the blood is present as (Mains 2011)

(a) bicarbonate in blood plasma and RBCs (b) free CO₂ in blood plasma (c) 70% carbamino-haemoglobin and 30% as bicarbonate (d) carbamino-haemoglobin in RBCs.

32 ➤ 32. What is true about RBCs in humans? (2010)

(a) They carry about 20-25 percent of CO2. (b) They transport 99.5 percent of O2. (c) They transport about 80 percent oxygen only and the rest 20 percent of it is transported in dissolved state in blood plasma. (d) They do not carry CO₂ at all.

33 ➤ 33. The haemoglobin of a human fetus (2009)

(a) has only 2 protein subunits instead of 4 (b) has a higher affinity for oxygen than that of an adult (c) has a lower affinity for oxygen than that of the adult (d) its affinity for oxygen is the same as that of an adult.

34 ➤ 34. The majority of carbon dioxide produced by our body cells is transported to the lungs as (2006)

(a) attached to haemoglobin (b) dissolved in the blood (c) as bicarbonates (d) as carbonates.

35 ➤ 35. Haemoglobin is a type of (1999)

(a) carbohydrate (b) respiratory pigment (c) vitamin (d) skin pigment.

36 ➤ 36. How the transport of O₂ and CO₂ by blood happens? (1996)

(a) With the help of WBCs and blood serum (b) With the help of platelets and corpuscles (c) With the help of RBCs and blood plasma (d) With the help of RBCs and WBCS

37 ➤ 37. At high altitude, the RBCs in the human blood will (1995)

(a) increase in number (b) decrease in number (c) increase in size (d) decrease in size.

38 ➤ 38. Although much CO₂ is carried in blood, yet blood does not become acidic, because (1995)

(a) CO₂ is continuously diffused through the tissues and is not allowed to accumulate (b) in CO₂ transport, blood buffers play an important role (c) CO₂ is absorbed by the leucocytes (d) CO₂ combines with water to form H₂CO₂ which is neutralised by NaCO3.

39 ➤ 39. The carbon dioxide is transported via blood to lungs mostly (1995)

(a) in combination with haemoglobin only (b) dissolved in blood plasma (c) in the form of bicarbonate ions (d) as carbamino-haemoglobin and as carbonic acid.

40 ➤ 40. Carbon dioxide is transported from tissues to respiratory surface by only (1993)

(a) plasma and erythrocytes (b) plasma (c) erythrocytes (d) erythrocytes and leucocytes.

41 ➤ 41. When you hold your breath, which of the following gas changes in blood would first lead to the urge to breathe? (2015 Cancelled)

(a) Falling CO₂ concentration (b) Rising CO₂ and falling O₂ concentration (c) Falling O₂ concentration (d) Rising CO₂ concentration

42 ➤ 42. The respiratory centres, which control inspiration and expiration, are located in (1999)

(a) diencephalon (b) medulla oblongata (c) cerebellum (d) spinal cord.

43 ➤ 43. The respiratory centre which regulates respiration is located in (1994)

(a) cerebellum (c) cerebral peduncle (b) medulla oblongata (d) the vagus nerve.

44 ➤ 44. Due to increasing air-borne allergens and pollutants, many people in urban areas are suffering from respiratory disorder that cause wheezing due to Fred (2019)

(a) reduction in the secretion of surfactant by pneumocytes (b) benign growth on mucous lining of nasal cavity (c) inflammation bronchioles of bronchi and (d) proliferation of fibrous tissues and damage of the alveolar walls.

45 ➤ 45. Which of the following options correctly represents the lung conditions in asthma and emphysema, respectively? (2018)

(a) Inflammation of bronchioles; Decreased respiratory surface (b) Increased number of bronchioles; Increased respiratory surface (c) Increased respiratory surface; Inflammation of bronchioles (d) Decreased respiratory surface; Inflammation of bronchioles

46 ➤ 46. Which of the following is an occupational respiratory disorder? (2018)

(a) Anthracis (b) Silicosis (c) Botulism (d) Emphysema

47 ➤ 47. Name the chronic respiratory disorder caused mainly by cigarette smoking. (NEET-I 2016)

(a) Respiratory acidosis (b) Respiratory alkalosis (c) Emphysema (d) Asthma

48 ➤ 48. Asthma may be attributed to (NEET-I 2016)

(a) inflammation of the trachea (b) accumulation of fluid in the lungs (c) bacterial infection of the lungs (d) allergic reaction of the mast cells in the lungs.

49 ➤ 49. Name the pulmonary disease in which alveolar surface area involved in gas exchange is drastically reduced due to damage in the alveolar walls. (2015)

(a) Pneumonia (b) Asthma (c) Pleurisy (d) Emphysema

50 ➤ 50. Which one of the following is the correct statement for respiration in humans? (2012)

(a) Cigarette smoking may lead to inflammation of bronchi. (b) Neural signals from pneumotoxic centre in pons region of brain can increase the duration of inspiration. (c) Workers in grinding and stone-breaking industries may suffer from lung fibrosis. (d) About 90% of carbon dioxide (CO₂) is carried by haemoglobin as carbamino- haemoglobin.

51 ➤ 51. Blood analysis of a patient reveals an unusually high quantity of carboxyhaemoglobin content. Which of the following conclusions is most likely to be correct? The patient has been inhaling polluted air containing unusually high content of (2004)

(a) carbon disulphide (b) chloroform (c) carbon dioxide (d) carbon monoxide.

52 ➤ 52. When CO₂ concentration in blood increases breathing becomes (2004)

(a) shallower and slow (b) there is no effect on breathing (c) slow and deep (d) faster and deeper.

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