Breathing And Exchange Of Gases Multiple Choice Question and Answers

by

Breathing And Exchange Of Gases Multiple Choice Questions

Question 1. Lungs are made up of air-filled sacs, the alveoli. They do not collapse even after forceful expiration, because of-

  1. Inspiratory Reserve Volume
  2. Tidal Volume
  3. Expiratory Reserve Volume
  4. Residual Volume

Answer: 4. Residual Volume

Question 2. Asthma may be attributed to—

  1. Allergic reaction of the mast cells in the lungs
  2. Inflammation of the trachea
  3. Accumulation of fluid in the lungs
  4. Bacterial infection of the lungs

Answer: 1. Allergic reaction of the mast cells in the lungs

Question 3. Name the chronic respiratory disorder caused mainly by cigarette smoking.

  1. Asthma
  2. Respiratory acidosis
  3. Respiratory alkalosis
  4. Emphysema

Answer: 4. Respiratory alkalosis

Read and Learn More WBCHSE Multiple Choice Question and Answers for Class 11 Biology

Question 4. The partial pressure of oxygen in the alveoli of the lungs is—

  1. Equal to that in the blood
  2. More than that in the blood
  3. Less than that in the blood
  4. Less than that of carbon dioxide

Answer: 2. More than that in the blood

Question 5. 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 pressure in the lungs
  2. There is a negative intrapleural pressure pulling at the lung walls
  3. There is a positive intrapleural pressure
  4. Pressure in the lungs is higher than the atmospheric pressure

Answer: 2. There is a positive intrapleural pressure

Question 6. Name the pulmonary disease in which the alveolar surface area in gas exchange is drastically reduced due to damage in the alveolar walls—

  1. Asthma
  2. Pleurisy
  3. Emphysema
  4. Pneumonia

Answer: 3. Emphysema

Question 7. The serous membrane which covers the lungs is called—

  1. Pericardium
  2. Peritoneum
  3. Perichondrium
  4. Pleura

Answer: 4. Pleura

Question 8. Approximately 70% 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 RBC
  4. As carbaminohaemoglobin

Answer: 1. As bicarbonate ions

Question 9. The volume of air that can be breathed in by maximum forced inspiration over and above the normal inspiration is called—

  1. Expiratory reserve volume
  2. Inspiratory reserve volume
  3. Vital capacity
  4. Inspiratory capacity

Answer: 2. Inspiratory reserve volume

Question 10. To generate pressure gradients to facilitate expiration and inspiration the human body uses the intercostal muscles and—

  1. Alveolar sac
  2. Bronchi
  3. Primary, secondary and tertiary bronchioles
  4. Diaphragm
  5. Windpipe

Answer: 4. Diaphragm

Question 11. Choose the wrong statement—

  1. The solubility of CO2 in blood is 20-25 times higher than that of O2
  2. The total volume of air accommodated in the lungs at the end of a forced inspiration is called the ‘vital capacity’
  3. O2 can bind with haemoglobin in a reversible manner to form oxyhaemoglobin
  4. Every 100 ml of deoxygenated blood delivers approximately 4 ml of CO2 to the alveoli
  5. The diffusion membrane is made of three major layers namely the thin squamous epithelium of alveoli, the endothelium of alveolar capillaries and the basement substance in between them.

Answer: 2. Every 100 ml of deoxygenated blood delivers approximately 4 ml of CO2 to the alveoli

Question 12. What are the PO2 and PcO2 in the systemic arteries?

  1. PO2 40 mm Hg; PcO2 45 mm Hg
  2. PO2 95 mm Hg; PcO2 40 mm Hg
  3. PO2 40 mm Hg; PcO2 40 mm Hg
  4. PO2 45 mm Hg; PcO2 40 mm Hg
  5. PO2 104 mm Hg; PcO2 159 mm Hg

Answer: 2. PO2 95 mm Hg; PcO2 40 mm Hg

Question 13. When the percentage saturation of haemoglobin with O2 is plotted against pO2, the curve obtained is—

  1. J-shaped
  2. Hyperbola
  3. Sigmoid
  4. U-shaped
  5. Urn-shaped

Answer: 3. Sigmoid

Question 14. The process of exchange of O2 from the atmosphere with CO2 produced by the cells is called—

  1. Biological respiration
  2. Photosynthesis
  3. Biological assimilation
  4. Gaseous exchange

Answer: 4. Gaseous exchange

Question 15. The inspiratory capacity of humans is equal to—

  1. TV + ERV
  2. TV + ERV + 1RV
  3. TV + IRV
  4. ERV + IRV

Answer: 3. TV + IRV

Question 16. The large volume of air a person can expire after a forceful inspiration is called—

  1. Tidal volume
  2. Vital capacity
  3. IRV
  4. ERV

Answer: 2. Vital capacity

Question 17. Skin is an accessory organ of respiration in—

  1. Human
  2. Frog
  3. Rabbit
  4. Lizard

Answer: 2. Frog

Question 18. When the oxygen supply to the tissue is inadequate, the condition is—

  1. Dyspnea
  2. Hypoxia
  3. Asphyxia
  4. Apnea

Answer: 2. Hypoxia

Question 19. During inspiration, the diaphragm—

  1. Expands
  2. Shows no change
  3. Contracts and flattens
  4. Relaxes to become dome-shaped

Answer: 3. Contracts and flattens

Question 20. The figure shows a diagrammatic view of the human respiratory system with labels A, B, C and D. Select the option which gives correct identification and main function and/or characteristic.

  1. A—Trachea—Lung tube supported by complete cartilaginous rings for conducting inspired air
  2. B—Pleural membrane—Surround ribs on both sides to provide cushion against rubbing
  3. C—Alveoli—Thin-walled vascular bag-like structures for the exchange of gases
  4. D—The lower end of lungs—Diaphragm pulls it down during inspiration

Biology Class 11 Chapter 17 Breathing And Exchange Of Gases MCQs Question 20

Answer: 3. C—Alveoli—Thin-walled vascular bag-like structures for the exchange of gases

Question 21. The oxygen dissociation curve is—

  1. Sigmoid
  2. Parabolic
  3. Hyperbolic
  4. Straight line

Answer: 1. Sigmoid

Question 22. Haemoglobin has a maximum affinity with—

  1. CO2
  2. CO
  3. O2
  4. NH3

Answer: 2. CO

Question 23. The oxygen toxicity is related to —

  1. Blood poisoning
  2. Collapse of alveolar walls
  3. Failure of ventilation of lungs
  4. Both and

Answer: 3. Failure of ventilation of lungs

Question 24. In the following functional human lung studies, identify the total lung capacity.

  1. Inspiratory Capacity (1C)
  2. Functional Residual Capacity (FRC)
  3. Vital Capacity (VC)
  4. Inspiratory Reserve Volume (IRV)
  5. Residual Volume (RV)
  6. Expiratory Reserve Volume (ERV).
  7. Tidal Volume (TV)

The correct answer is—

  1. 4 and 6
  2. 1 and 4
  3. 2 and 3
  4. 3 and 5

Answer: 4. 3 and 5

Question 15. People who have migrated from the planes to an I area adjoining Rohtang pass about six months back—

  1. Have more RBCs and their haemoglobin has a lower binding affinity to O2
  2. Are not physically fit to play games like football
  3. Suffer from altitude sickness with symptoms like nausea, fatigue, etc.
  4. Have the usual RBC count, but their haemoglobin has a very high binding affinity to O2

Answer: 1. Have more RBCs and their haemoglobin has a lower binding affinity to O2

Match the following columns:

Biology Class 11 Chapter 17 Breathing And Exchange Of Gases Match The Following 26

  1. 1-2,2-3,3-4,4-5,4-1
  2. 1-3,2-5,3-1,4-2,5-4
  3. 1-5,2-2,3-4,4-3,4-1
  4. 1-2,2-5,3-1,4-3,5-4

Answer: 4. 1-2,2-3,3-4,4-5,4-1

Leave a Comment