Breathing & Exchange of Gases PYQs Set 1 (PDF)

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Mere Teacher · Previous Year Questions NEET Biology · Breathing & Exchange of Gases · Set 1 (Q1-30)
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1. $Two friends are eating together on a dining table. One of them suddenly starts coughing while swallowing some food. This coughing would have been due to improper movement of$ (1) $Diaphragm$ (2) $Neck$ (3) $Tongue$ (4) $Epiglottis$ 2. $Select the favourable conditions required for the formation of oxyhaemoglobin at the alveoli.$ (1) $Low p O_{2}, high pC O_{2}, more H^{+}, higher temperature$ (2) $High p O_{2}, high pC O_{2}, less H^{+}, higher temperature$ (3) $Low p O_{2}, low pC O_{2}, more H^{+}, higher temperature$ (4) $High p O_{2}, low pC O_{2}, less H^{+}, lower temperature$ 3. $Under normal physiological conditions in human being every 100 ml of oxygenated blood can deliver ml of O_{2} to the tissues.$ (1) $10 ml$ (2) $2 ml$ (3) $5 ml$ (4) $4 ml$ 4. $Which one of the following statements is incorrect ?$ (1) $The residual air in lungs slightly decreases the efficiency of respiration in mammals$ (2) $The presence of non-respiratory air sacs, increases the efficiency of respiration in birds$ (3) $In insects, circulating body fluids serve to distribute oxygen to tissues$ (4) $The principle of counter current flow facilitates efficient respiration in gills offices$ 5. $The bulk of carbon dioxide C O_{2} released from body tissues into the blood is present as$ (1) $Bicarbonate in blood plasma and RBCs.$ (2) $Free C O_{2} in blood plasma.$ (3) $70 per cent carbamino haemogloin and 30 per cent as bicarbonate.$ (4) $Carbamino haemoglobin in RBCs.$ 6. $Due to increasing air-borne allergens and pollutants, many people in urban areas are suffering from respiratory disorder causing wheezing due to$ (1) $Benign growth on mucous lining of nasal cavity.$ (2) $Inflammation of bronchi and bronchioles.$ (3) $Proliferation of fibrous tissues and damage of the alveolar walls.$ (4) $Reduction in the secretion of surfactants by pneumocytes.$ 7. $Name the chronic respiratory disorder caused mainly by cigarette smoking:$ (1) $Emphysema$ (2) $Asthma$ (3) $Respiratory acidosis$ (4) $Respiratory alkalosis$ 8. $The majority of carbon dioxide produced by our body cells is transported to the lungs -$ (1) $Dissolved in the blood$ (2) $As bicarbonates$ (3) $As carbonates$ (4) $Attached to haemoglobin$ 9. $Listed below are the four respiratory capacities (1 to 4) and four jumbled respiratory volumes of a normal human adult Respiratory capacities Respiratory volumes (i) Residual volume 2500 mL (ii) Vital capacity 3500 mL (iii) Inspiratory reserve volume 1200 mL (iv) Inspiratory capacity 4500 mL Which one of the following is the correct matching of two capacities and volumes?$ (1) $(ii) 2500 mL (iii) 4500 mL$ (2) $(iv) 3500 mL (i) 1200 mL$ (3) $(iii) 1200 mL (iv) 2500 mL$ (4) $(i) 4500 mL (ii) 3500 mL$ 10. $Identify the wrong statement with reference to transport of oxygen.$ (1) $Partial pressure of CO_{2} can interfere with O_{2} binding with haemoglobin.$ (2) $Higher H^{+} conc. in alveoli favours the formation of oxyhaemoglobin.$ (3) $Low pCO_{2} in alveoli favours the formation of oxyhaemoglobin.$ (4) $Binding of oxygen with haemoglobin is mainly related to partial pressure of O_{2} .$ 11. $Lungs do not collapse between breaths and some air always remains in the lungs which can never be expelled because$ (1) $There is a negative intrapleural pressure pulling at the lung walls$ (2) $There is a positive intrapleural pressure$ (3) $Pressure in the lungs is higher than the atmospheric pressure$ (4) $There is a negative pressure in the lungs$ 12. $The partial pressures (in mm Hg ) of oxygen (O_{2}) and carbon dioxide (CO_{2}) at alveoli (the site of diffusion) are:$ (1) $pO_{2} = 40 and pCO_{2} = 45$ (2) $pO_{2} = 95 and pCO_{2} = 40$ (3) $pO_{2} = 159 and pCO_{2} = 0.3$ (4) $pO_{2} = 104 and pCO_{2} = 40$ 13. $Which of the following is not the function of conducting part of respiratory system?$ (1) $Inhaled air is humidified$ (2) $Temperature of inhaled air is brought to body temperature$ (3) $Provides surface for diffusion of O_{2} and C O_{2}$ (4) $It clears inhaled air from foreign particles$ 14. $The Total Lung Capacity (TLC) is the total volume of air accommodated in the lungs at the end of a forced inspiration. This includes:$ (1) $RV; IC (Inspiratory Capacity); EC (Expiratory Capacity); and ERV$ (2) $RV; ERV; IC and EC$ (3) $RV; ERV; VC (Vital Capacity) and FRC (Functional Residual Capacity)$ (4) $RV (Residual Volume); ERV (Expiratory Reserve Volume); TV (Tidal Volume); and IRV (Inspiratory Reserve Volume)$ 15. $Tidal Volume and Expiratory Reserve Volume of an athlete is 500 mL and 1000 mL respectively. What will be his Expiratory Capacity if the Residual Volume is 1200 mL?$ (1) $1500 mL$ (2) $1700 mL$ (3) $2200 mL$ (4) $2700 m$ 16. $Identify the region of human brain which has pneumotaxic center that alters respiratory rate by reducing the duration of inspiration.$ (1) $Medulla$ (2) $Pons$ (3) $Thalamus$ (4) $Cerebrum$ 17. $Which of the following disorders represents decrease in respiratory surface due to damaged alveolar walls?$ (1) $Bronchitis$ (2) $Asthma$ (3) $Emphysema$ (4) $Hypocapnia$ 18. $Approximately seventy percent of carbon dioxide absorbed by the blood will be transported to the lungs$ (1) $As bicarbonate ions$ (2) $In the form of dissolved gas molecules$ (3) $By binding to R.B.C.$ (4) $As carbamino - haemoglobin$ 19. $Which one of the following is a possibility for most of us with regard to breathing by making a conscious effort?$ (1) $One can breathe out air totally without oxygen.$ (2) $One can breathe out air through Eustachian tube by closing both nose and mouth.$ (3) $One can consciously breathe in and breathe out by moving the diaphragm alone, without moving the ribs at all.$ (4) $The lungs can be made fully empty by forcefully breathing out all air from them.$ 20. $The partial pressure of oxygen in the alveoli of the lungs is$ (1) $Les than that of carbon dioxide$ (2) $Less than that in the blood$ (3) $More than that in the blood$ (4) $Equal to that in the blood$ 21. $Bulk of carbon dioxide (C O_{2}) released from body tissues into the blood is present as :$ (1) $Carbamino-haemoglobin in RBCs$ (2) $Bicarbonate in blood plasma and RBCs$ (3) $Free C O_{2} in blood plasma$ (4) $70% carbamino-haemoglobin and 30%as bicarbonate$ 22. $The maximum volume of air a person can breathe in after a forced expiration is known as :$ (1) $Expiratory Capacity$ (2) $Vital Capacity$ (3) $Inspiratory Capacity$ (4) $Total lung Capacity$ 23. $In the regulation of respiration, a chemo sensitive area adjacent to the rhythm centre in the medulla region of the brain, is highly sensitive to :$ (1) $C O_{2}$ (2) $O_{2}$ (3) $N_{2}$ (4) $HCO_{3}^{-}$ 24. $Which one of the following is the correct statement for respiration in humans?$ (1) $Cigarette smoking may lead to inflammation of bronchi.$ (2) $Neural signals form pneumotoxic centre in pons region of brain can increase the duration of inspiration.$ (3) $Workers in grinding and stone-breaking industries may suffer from lung fibrosis.$ (4) $About 90 per cent of carbon dioxide C O_{2} is carried out by haemoglobin as carbamino haemoglobin.$ 25. $When you hold your breath, which of the following gas changes in blood would first lead to the urge in breathe?$ (1) $Falling O_{2} concentration$ (2) $Rising C O_{2} concentration$ (3) $Falling C O_{2} concentration$ (4) $Rising C O_{2} and falling O_{2} concentration$ 26. $A large proportion of oxygen is left unused in the human blood even after its uptake by the body tissues. This O_{2}$ (1) $Raises the pCO2 of blood to 75 mm of Hg.$ (2) $Is enough to keep oxyhaemoglobin.$ (3) $Helps in releasing more O_{2} to the epithelial tissues.$ (4) $Acts as a reserve during muscular exercise.$ 27. $A large proportion of oxygen is left un used in the human blood even after its up take by the body tissues. This O_{2} :$ (1) $Acts as a reserve during muscular exercise$ (2) $Raises the pC O_{2} of blood to 75 mm of Hg.$ (3) $Is enough to keep oxyhaemoglobin saturation at 96%$ (4) $Helps in releasing more O_{2} to the epithelial tissues$ 28. $Bowman's glands are found in -$ (1) $Olfactory epithelium$ (2) $External auditory canal$ (3) $Cortical nephrons only$ (4) $Juxtamedullary nephrons$ 29. $What is vital capacity of our lungs?$ (1) $inspiratory reserve volume plus expiratory reserve volume$ (2) $total lung capacity minus residual volume$ (3) $inspiratory reserve volume plus tidal volume$ (4) $total lung capacity minus expiratory reserve volume$ 30. $Reduction in pH of blood will:$ (1) $Reduce the rate of heart beat$ (2) $Reduce the blood supply to the brain$ (3) $Decrease the affinity of hemoglobin with oxygen$ (4) $None of these$