MCQ Chapter 17 Breathing and Exchange of Gases Class 11 Biology

Please refer to Breathing and Exchange of Gases MCQ Questions Class 11 Biology below. These MCQ questions for Class 11 Biology with answers have been designed as per the latest NCERT, CBSE books, and syllabus issued for the current academic year. These objective questions for Breathing and Exchange of Gases will help you to prepare for the exams and get more marks.

Breathing and Exchange of Gases MCQ Questions Class 11 Biology

Please see solved MCQ Questions for Breathing and Exchange of Gases in Class 11 Biology. All questions and answers have been prepared by expert faculty of standard 11 based on the latest examination guidelines.

MCQ Questions Class 11 Biology Breathing and Exchange of Gases

Question- Which of the following statements is incorrect for ECG of human heart?
(a) It is graphical representation of the electrical activity of the heart during a cardiac cycle.
(b) The ECG of a person is obtained by using a machine called electrocardiogram.
(c) To obtain a standard ECG a patient is connected to the machine with three electrical leads.
(d) Each peak in the ECG is identified with a letter from P to T that corresponds to a specific electrical activity of the heart.

Question– Select the correct statement.
(a) Inter-atrial septum is a thick partition while atrio-ventricular partitions are thin.
(b) Mitral valve is having 2 fibrous nonmuscular cusps.
(c) Size of heart is equivalent to the size of clenched fist.
(d) All of the above.

Question– The correct order of duration of various phases of the cardiac cycle is:
(a) Atrial systole < Ventricular systole < Joint diastole < Ventricular diastole < Atrial diastole
(b) Atrial systole < Ventricular diastole < Joint diastole < Ventricular systole < Atrial diastole
(c) Atrial diastole < Ventricular diastole < Joint diastole < Ventricular systole < Atrial systole
(d) All of the above

Question– The blood stem cells are related to which among the following options:
(a) Liver
(b) Spleen
(c) Kidney
(d) Bone marrow

Question– The net pressure gradient that causes the fluid to filter out from the glomeruli into the capsule is-
(a) 50 mm Hg
(b) 75 mm Hg
(c) 10 mm Hg
(d) 30 mm Hg

Question– The nephridia of earthworm are related with :-
(a) Locomotion
(b) Excretion of nitrogenous wastes
(c) Digestion
(d) Respiration

Question- Angiotensin –II will lead to all of the following except :-
(a) Vasoconstriction
(b) Hypernatremia
(c) Increasing GFR
(d) Excretion of Na⁺ in urine

Question- Which of the following is incorrect match about human excretory system?
(a) Columns of Bertini: extension of cortex in between the renal pyramids.
(b) Renal corpuscle: Bowman’s capsule plus glomerulus.
(c) Cortical nephrons: Vasa recta is absent or highly reduced.
(d) Podocytes: Cuboidal epithelium of Bowman’s capsule.

Question- Which of the following statements about the functioning of the kidney is correct?
I. On an average 1100-1200ml of blood is filtered by the kidneys per minute which constitute roughly 1/5th of the blood
pumped out by each ventricle of the heart in a minute.
II. JGA is a special sensitive region formed by cellular modification in the distal convoluted tubule and the glomerulus at the location of their contact.
III. The ascending limb of Henle’s loop is impermeable to water but allows transport of electrolytes.
IV. The collecting duct allows passage of small amounts of urea into the medullary interstitium to keep up the osmolarity.
(a) I and II 
(b) I, III and IV
(c) I, II, and III 
(d) II, III, and IV

Question- Which of these statements about sphincters of urethra is correct?
(a) Interal urethral sphincter is made up of smooth muscles while external urethral sphincter is made up of striated muscles.
(b) Interal urethral sphincter is made up of striated muscles while external urethral sphincter is made up of smooth muscles.
(c) Both internal and external urethral sphincters are made up of smooth muscles.
(d) Both internal and external urethral sphincters are made up of striated muscles.

Question- Identify the correct statements regarding urine formation?
(a) Countercurrent mechanism works around the PCT and glomerulus.
(b) To prevent diuresis ADH facilitates water reabsorption from the latter parts of the tubule.
(c) Maximum reabsorption of electrolytes occurs in the Henle’s loop.
(d) A decrease in blood pressure can increase the GFR.

Question- Which of the following substances are secreted by tubular cells into the filtrate during urine formation?
(a) Glucose, amino acid, Na⁺
(b) H⁺ , K⁺ , amino acid
(c) Na⁺ , K⁺ , amino acids
(d) K⁺ , H⁺ , ammonia

Question- A person with chronic kidney failure will have:
(a) High blood urea and high serum creatinine levels.
(b) High blood urea and low serum creatinine levels.
(c) Low blood urea and high serum creatinine levels.
(d) Low blood urea and low serum creatinine levels.

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

Question- The structure which prevents the entry of food into the windpipe is
(a) gullet
(b) glottis
(c) tonsil
(d) epiglottis

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-  Intercostal muscles are found attached with
(a) diaphragm
(b) ribs
(c) pleura
(d) lungs

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- 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- The path that leads from the throat to the lungs is known as
(a) trachea
(b) oesophagus
(c) epiglottis
(d) larynx

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

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- 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- 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- 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- 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- 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- 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- The structure which does not contribute to the breathing movements in mammals is
(a) larynx
(b) ribs
(c) diaphragm
(d) intercostal muscles

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

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

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

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

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

Question- Which of the following has no specialized respiratory structures ?
(a) Crab
(b) Earthworm
(c) Salmon
(d) Ant

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

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

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

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

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- 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- Lungs are present in
(a) mediastinum
(b) pleural cavity
(c) pericardial cavity
(d) thoracic cavity

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

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

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- __(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- 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- The smallest and thinnest tube in the lung is
(a) trachea
(b) larynx
(c) bronchi
(d) bronchiole

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- 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- 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- 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 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- 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 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.