NCERT Exemplar Class 11 Biology Chapter 17: Breathing and Exchange of Gases

NCERT Exemplar Class 11 Biology Chapter 17: Breathing and Exchange of Gases. NCERT Exemplar Solutions for Class 11 Biology Chapter 17 Breathing and Exchange of Gases prepare students for their Class 11 exams thoroughly.

Biology problems and solutions for the Class 11 pdf are provided here which are similar to the questions being asked in the previous year's board.

NCERT Exemplar Class 11 Biology Chapter 17: Breathing and Exchange of Gases

Class 11: Biology Chapter 17 solutions. Complete Class 11 Biology Chapter 17 Notes.

Multiple Choice Questions

1. Respiration in insects is called direct because
   • a. The tissues exchange O₂ / CO₂ directly with the air in the tubes
   • b. The tissues exchange O₂ / CO₂ directly with coelomic fluid
   • c. The tissues exchange O₂ / CO₂ directly with the air outside through body surface
   • d. Tracheal tubes exchange O₂ / CO₂ directly with the haemocoel which then exchange with tissues
2. Regarding the functions of our respiratory system, mark the wrong entry.
   • a. Humidifies the air
   • b. Warms up the air
   • c. Diffusion of gases
   • d. Cleans up the air
3. A person suffers punctures in his chest cavity in an accident, without any damage to the lungs its effect could be
   • a. Reduced breathing rate
   • b. Rapid increase in breathing rate
   • c. No change in respiration
   • d. Cessation of breathing
4. It is known that exposure to carbon monoxide is harmful to animals because
   • a. It reduces CO₂ transport
   • b. It reduces O₂ transport
   • c. It increases CO₂ transport
   • d. It destroys hemoglobin
5. Mark the true statement among the following with reference to normal breathing
   • a. Inspiration is a passive process where as expiration is active
   • b. Inspiration is a active process where as expiration is passive
   • c. Inspiration and expiration are active processes
   • d. Inspiration and expiration are passive processes
6. A person breathes in some volume of air by forced inspiration after having a forced expiration. This quantity of air taken in is
   • a. Total lung capacity
   • b. Tidal volume
   • c. Vital capacity
   • d. Inspiratory capacity
7. Mark the incorrect statement in context to O2 binding to Hb
   • a. Higher pH
   • b. Lower temperature
   • c. Lower pCO₂
   • d. Higher PO₂
8. Mark the correct pair of muscles involved in the normal breathing in humans
   • a. External and internal intercostal muscles
   • b. Diaphragm and abdominal muscles
   • c. Diaphragm and external intercostal muscles
   • d. Diaphragm and internal intercostal muscles
9. Incidence of Emphysema – a respiratory disorder is high in cigarette smokers. In such cases
   • a. The bronchioles are found damaged
   • b. The alveolar walls are found damaged
   • c. The plasma membrane is found damaged
   • d. The respiratory muscles are found damaged
10. Respiratory process is regulated by certain specialized centres in the brain. One of the following listed centres can reduce the inspiratory duration upon stimulation
    • a. Medullary inspiratory centre
    • b. Pneumotaxic centre
    • c. Apneustic centre
    • d. Chemosensitive centre
11. CO₂ dissociates from carbamino haemoglobin when
    • a. pCO₂ is high & pO₂ is low
    • b. pO₂ is high and pCO₂ is low
    • c. pCO₂ and pO₂ are equal
    • d. None of the above
12. In breathing movements, air volume can be estimated by
    • a. Stethoscope
    • b. Hygrometer
    • c. Sphygmomanometer
    • d. Spirometer
13. Identify the correct and incorrect match about respiratory volume and capacities and mark the correct answer
    i. Inspiratory capacity (IC) = Tidal Volume + Residual Volume
    ii. Vital Capacity (VC) = Tidal Volume (TV) + Inspiratory Reserve Volume (IRV) + Expiratory Reserve Volume (ERV).
    iii. Residual Volume (RV) = V ital Capacity (VC) – Inspiratory Reserve Volume (IRV)
    iv. Tidal Volume (TV) = Inspiratory Capacity (IC) – Inspiratory Reserve Volume (IRV)
    Options:
    • a. (i) Incorrect, (ii) Incorrect, (iii) Incorrect, (iv) Correct
    • b. (i) Incorrect, (ii) Correct, (iii) Incorrect, (iv) Correct
    • c. (i) Correct, (ii) Correct, (iii) Incorrect, (iv) Correct
    • d. (i) Correct, (ii) Incorrect, (iii) Correct, (iv) Incorrect
14. The oxygen – haemoglobin dissociation curve will show a right shift in case of
    • a. High pCO₂
    • b. High pO₂
    • c. Low pCO₂
    • d. Less H⁺ concentration
15. Match the following and mark the correct options
    
    Options:
    • a. A-ii, B-i, C-iv, D-iii
    • b. A-i, B-iv, C-ii, D-iii
    • c. A-i, B-iii, C-ii, D-iv
    • d. A-i, B-ii, C-i.v, D-iii

Very Short Answer Type Questions

1. Define the following terms?
   • a. Tidal volume
   • b. Residual volume
   • c. Asthma
2. A fluid filled double membranous layer surrounds the lungs. Name it and mention its important function.
3. Name the primary site of exchange of gases in our body?
4. Cigarette smoking causes emphysema. Give reason.
5. What is the amount of O₂ supplied to tissues through every 100 ml. of oxygenated blood under normal physiological conditions?
6. A major percentage (97%) of O₂ is transported by RBCs in the blood. How does the remaining percentage (3%) of O₂ transported?
7. Arrange the following terms based on their volumes in an ascending order
   • a. Tidal Volume (TV)
   • b. Residual Volume (RV)
   • c. Inspiratory Reserve Volume (IRV)
   • d. Expiratory Capacity (EC)
8. Complete the missing terms
   • a. Inspiratory Capacity (IC) = _____ +IRV
   • b. ___________________ = TV + ERV
   • c. Functional Residual Capacity (FRC) = ERV + ____
9. Name the organs of respiration in the following organisms:
   
10. Name the important parts involved in creating a pressure gradient between lungs and the atmosphere during normal respiration.

Short Answer Type Questions

1. State the different modes of CO₂ transport in blood.
2. Compared to O₂, diffusion rate of CO₂ through the diffusion membrane per unit difference in partial pressure is much higher. Explain.
3. For completion of respiration process, write the given steps in sequential manner
   • a. Diffusion of gases (O₂ and CO₂) across alveolar membrane.
   • b. Transport of gases by blood.
   • c. Utilisation of O₂ by the cells for catabolic reactions and resultant release of CO₂.
   • d. Pulmonary ventilation by which atmospheric air is drawn in and CO₂ rich alveolar air is released out.
   • e. Diffusion of O₂ and CO₂between blood and tissues.
4. Differentiate between
   • a. Inspiratory and expiratory reserve volume
   • b. Vital capacity and total lung capacity
   • c. Emphysema and occupational respiratory disorder

Long Answer Type Questions

1. Explain the transport of O2 and CO2 between alveoli and tissue with diagram.
2. Explain the mechanism of breathing with neat labelled sketches.
3. Explain the role of neural system in regulation of respiration.

Answers to Multiple Choice Questions

1- d;	2- d;	3- d;	4- d;	5- b;	6- a;
7- d;	8- d;	9- b;	10- b;	11- b;	12- d;
13 -b;	14- b;	15 -b