MCQs For NCERT Class 11 Biology Chapter 17 Breathing and Exchange of Gases

Please refer to the MCQ Questions for Class 11 Biology Chapter 17 Breathing and Exchange of Gases with Answers. The following Breathing and Exchange of Gases Class 11 Biology MCQ Questions have been designed based on the latest syllabus and examination pattern for Class 11. Our experts have designed MCQ Questions for Class 11 Biology with Answers for all chapters in your NCERT Class 11 Biology book.

Breathing and Exchange of Gases Class 11 MCQ Questions with Answers

See below Breathing and Exchange of Gases Class 11 Biology MCQ Questions, solve the questions and compare your answers with the solutions provided below.

Question. The amount of air remaining in the air passages and alveoli
at the end of quiet respiration is called
(a) tidal volume
(b) inspirating reserve volume
(c) inspiratory capacity
(d) functional residual capacity

Question. The total volume of air a person can expire after normal inspiration is called
(a) residual volume
(b) vital capacity
(c) expiratory capacity
(d) functional residual capacity

Question. Functional residual capacity can be represented as
(a) TV + ERV
(b) ERV + RV
(c) RV + IRV
(d) ERV + TV + IRV

Question. Membrane separating air in pulmonary alveoli from blood capillaries is
(a) alveolar epithelium
(b) cardiac epithelium
(c) endothelium of blood capillaries
(d) both (a) and (c)

Question. The nose produces ____________ to put moisture in the air and catch dust and bacteria.
(a) mucus
(b) bronchi
(c) cilia
(d) oxygen

Question. The total lung capacity is represented by
(a) Tidal volume + Vital capacity
(b) Tidal volume + Residual volume
(c) Vital capacity + Residual volume
(d) Inspiratory + Expiratory reserve volumes

Question. In anaerobic respiration
(a) O₂ is taken in.
(b) CO₂ is taken in.
(c) O₂ is given out.
(d) CO₂ is given out.

Question. Every 100 ml of oxygenated blood delivers following amount of O₂ to the tissues under normal physiological contition.
(a) 5 ml
(b) 25 ml
(c) 50 ml
(d) More than 50 ml

Question. What will be the pO₂ and pCO₂ in the atmospheric air as compared to that of alveolar air ?
(a) pO₂ lesser and pCO₂ higher
(b) pO₂ higher and pCO₂ lesser
(c) Both pO₂ and pCO₂ lesser
(d) Both pO₂ and pCO₂ higher

Question. As blood becomes fully O₂ saturated, haemoglobin combines with____ molecule(s) of oxygen.
(a) 1
(b) 2
(c) 4
(d) 8

Question. When 1200 mL air is left in the lungs, it is called
(a) vital capacity
(b) tidal volume
(c) residual volume
(d) inspiratory reserve volume

Question. The volume of air breathed in and out during normal breathing is called
(a) vital capacity
(b) inspiratory reserve volume
(c) expiratory reserve volume
(d) tidal volume

Question. What percentage of oxygen is carried by haemoglobin ?
(a) 90
(b) 98
(c) 23
(d) 73

Question. Partial pressure of oxygen in inspired and expired air is ……. and ……. mm of Hg.
(a) 100, 46
(b) 158, 40
(c) 158, 90
(d) 100, 95

Question. Which of the following gases makes the most stable combination with the haemoglobin of RBCs?
(a) CO₂
(b) CO
(c) O₂
(d) N

Question. In mammals, carbon dioxide is transported from tissues to respiratory surface by
(a) plasma
(b) R.B.C.
(c) W.B.C.
(d) both (a) and (b)

Question. __(i)__ in CO₂ in your blood, which causes __(ii)__ in pH, would cause your breathing to speed up.
(a) (i) An increase, (ii) a rise
(b) (i) An increase, (ii) a drop
(c) (i) A decrease, (ii) a rise
(d) (i) A decrease, (ii) a drop

Question. Carbonic anhydrase is found in high concentration in
(a) leucocytes
(b) blood plasma
(c) erythrocytes
(d) lymphocytes

Question. p₅₀ value denotes
(a) percentage of oxygen
(b) partial pressure of O₂
(c) percentage of haemoglobin
(d) percentage of oxyhaemoglobin

Question. Most oxygen is carried by the blood __(i)__. Most carbon dioxide is carried by the blood __(ii)__.
(a) (i) attached to haemoglobin. (ii) in the form of bicarbonate ions.
(b) (i) dissolved in plasma . (ii) dissolved in plasma.
(c) (i) in the form of H⁺ ions . (ii) in the form of bicarbonate ions.
(d) (i) attached to haemoglobin. (ii) attached to haemoglobin.

Question. Dissociation of oxyhaemoglobin can be promoted by
(a) low pCO₂
(b) high pCO₂
(c) low body temperature
(d) high blood pH

Question. Which of the following structures is the actual gas exchange surface in the mammalian respiratory system ?
(a) Bronchus
(b) Alveolus
(c) Bronchiole
(d) Trachea

Question. Asthma is caused due to
(a) infection of lungs.
(b) spasm in bronchial muscles.
(c) bleeding into pleural cavity.
(d) infection of trachea.

Question. Emphysema developes mainly because of
(a) allergy or hypersensitization.
(b) spasm of the smooth muscles of bronchioles.
(c) cigarette smoking.
(d) inflammation of the alveoli

Question. Respiratory mechanism is controlled by
(a) central nervous system
(b) sympathetic nervous system
(c) parasympathetic nervous system
(d) autonomic nervous system

Question. The respiratory centre, which regulates respiration, is located in
(a) cerebral peduncle
(b) vagus nerve
(c) pons varolii
(d) medulla oblongata

Question. Residual air mostly occurs in
(a) alveoli
(b) bronchus
(c) nostrils
(d) trachea

Question. Every 100 ml of deoxygenated blood delivers approximately _________________.
(a) 5ml of CO to the alveoli
(b) 6ml of CO₂ to the plasma
(c) 4ml of CO₂ to the alveoli
(d) 7ml of CO to the plasma

Question. The volume of the air that leaves the lungs in human is measured by
(a) respirometer
(b) spirometer
(c) sphygmomanometer
(d) monometer

Question. Which of the following organ receives electrical messages from the brain for breathing in and out?
(a) Diaphragm
(b) Bronchi
(c) Bronchioles
(d) Alveoli

Question. Which of the following group are supported by incomplete cartilaginous rings?
(a) Pharynx, primary & tertiary bronchi and initial bronchioles.
(b) Trachea, primary & secondary bronchi, and initial bronchioles.
(c) Larynx, primary, secondary and tertiary bronchi, and initial bronchioles.
(d) Trachea, primary, secondary and tertiary bronchi, and initial bronchioles.

Question. The pneumotaxic centre that can moderate the function of respiratory rhythm centre is located in
(a) dorsal side of medulla
(b) ventral side of medulla
(c) aortic arch and carotid artery
(d) pons varolii

Question. Which of the following normally contains the highest concentration of oxygen ?
(a) Body cells
(b) Inhaled air
(c) Air in the pulmonary trunk
(d) Blood entering the lungs

Question. Which of the following statement is incorrect?
(a) Diffusion membrane is made up of 3-major layers.
(b) Solubility of CO₂ is higher than O₂ by 25 times.
(c) Breathing volumes are estimated by spirometer.
(d) High conc. of hydrogen ions favours oxyhaemoglobin formation.

Question. With reference to human respiration, which is correct?
(a) Pulmonary ventilation is equal to alveolar ventilation.
(b) Alveolar ventilation is more than pulmonary ventilation.
(c) Alveolar ventilation is less than pulmonary ventilation.
(d) Pulmonary ventilation is less than alveolar ventilation.

Question. Which of the following statement correctly defines Bohr effect?
(a) Rise in p₅₀ with a decrease in CO₂ conc.
(b) Rise in p₅₀ with decrease in pH.
(c) Rise in p₅₀ with increase in O₂.
(d) Fall in p₅₀ with decrease in pH.

Question. Thoracic chamber is formed (A) by the vertebral column, (B) by the sternum, (C) by the ribs and on the (D) side by the dome shaped diaphragm. Identify A, B, C and D.
(a) A – dorsally, B – ventrally, C – laterally, D – lower
(b) A – ventrally, B – laterally, C – dorsally, D – upper
(c) A – laterally, B – ventrally, C – dorsally, D – lower
(d) A – dorsally, B – laterally, C – ventrally, D – upper

Question. Which of the following statement is correct?
(a) Tracheal rings are of hyaline cartilage .
(b) Dorsal side of thoracic chamber is formed by sternum.
(c) Expiration occurs when there is negative pressure in lungs.
(d) All of the above

Question. Which one of the following statement is correct?
(a) All animals require a medium for cellular respiration.
(b) In all animals oxygen is transported by blood.
(c) All animals need oxygen for respiration.
(d) All of the above

Question. Which one of the following is the correct statement for respiration in humans?
(a) Workers in grinding and stone-breaking industries may suffer from lung fibrosis.
(b) About 90% of carbon dioxide (CO₂) is carried by haemoglobin as carbaminohaemoglobin.
(c) Cigarette smoking may lead to inflammation of bronchi.
(d) Neural signals from pneumotaxic centre in pons region of brain can increase the duration of inspiration.

Question. Mark the correct statement.
(a) Volume of residual air is higher than tidal volume.
(b) Volume of complementary air is higher than tidal volume.
(c) Volume of supplementary air is lower than residual capacity.
(d) All of the above

Question. Which of the following statements is correct?
(a) Inspiration is a passive process whereas expiration is active.
(b) Inspiration is active process whereas expiration is passive.
(c) Inspiration and expiration are active process.
(d) Inspiration and expiration are passive process.

Question. Which of the following conditions is responsible for increase in ventilation rate of lungs ?
(a) Increase of CO₂ content in inhaled air.
(b) Increase of CO₂ content in exhaled air.
(c) Decrease in O₂ content of inhaled air.
(d) Decrease in O₂ content of exhaled air.

Question. The correct statement in respect of protein haemoglobin
is that it
(a) maintains blood sugar level.
(b) acts as an oxygen carrier in the blood.
(c) functions as a catalyst for biological reactions.
(d) forms antibodies and offers resistance to diseases.

Question. Identify the correct statement with reference to transport of respiratory gases by blood ?
(a) Haemoglobin is necessary for transport of carbon dioxide and carbonic anhydrase for transport of oxygen.
(b) Haemoglobin is necessary for transport of oxygen and carbonic anhydrase for transport of carbon dioxide.
(c) Only oxygen is transported by blood.
(d) Only carbon dioxide is transported by blood.

Question. Which of the following statements are true/false?
(i) The blood transports CO₂ comparatively easily because of its higher solubility.
(ii) Approximately 8 -.9% of CO₂ is transported being dissolved in the plasma of blood.
(iii) The carbon dioxide produced by the tissues, diffuses passively into the blood stream and passes into red blood corpuscles and react with water to form H₂CO₃
(iv) The oxyhaemoglobin (HbO₂) of the erythrocytes is basic.
(v) The chloride ions diffuse from plasma into the erythrocytes to maintain ionic balance.
(a) (i), (iii) and (v) are true; (ii) and (iv) are false.
(b) (i), (iii) and (v) are false; (ii) and (iv) are true.
(c) (i), (ii), and (iv) are true; (iii) and (v) are false.
(d) (i), (ii) and (iv) are false; (iii) and (v) are true.

Question. Read the following statements and select the correct option.
(i) Carbonic anhydrase is present in the erythrocytes .
(ii) In erythrocytes the carbon dioxide combine with water and is transported.
(a) Statement (i) is correct and is responsible for statement (ii).
(b) Statement (i) is not correct but statement (ii) is correct.
(c) Both statement (i) and (ii) are incorrect.
(d) Statement (i) is correct but not involved in statement (ii).

Question. What happens during breathing?
(i) Size of our chest increases.
(ii) Size of our chest decreases.
(iii) Carbon dioxide is removed out from body.
(iv) Air enters our lungs.
(a) (i) and (ii)
(b) (i) and (iv)
(c) (ii) and (iii)
(d) (ii) and (iv)

Question. Air travels through
(i) Nose (ii) Skin
(iii) Trachea (iv) Mouth
(a) Both (i) and (ii)
(b) Both (i) and (iv)
(c) only (i)
(d) only (ii)

Question. Which one of the followings statements is not correct?
(a) Total volume of air a person can expire after a normal inspiration is called expiratory capacity.
(b) Binding of oxygen with haemoglobin is primarily related to partial pressure of CO₂.
(c) Every 100 ml of deoxygenated blood delivers approximately 4 ml of CO₂ to the alveoli.
(d) Every 100 ml of oxygenated blood can deliver around 5 ml of O₂ to the tissues under normal physiological conditions.