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Breathing and Exchange of Gases Class 11 MCQs Questions with Answers
Solving Breathing and Exchange of Gases Multiple Choice Questions of Class 11 Biology Chapter 17 MCQ can be really beneficial because you will be familiar with all of the topics. These MCQ Questions on Breathing and Exchange of Gases Class 11 with answers provide for a quick review of the Chapter, allowing you to have a better understanding of the subject.
I. Select the correct answers from the following questions:
Question 1.
Which of the following is not a step in the process of respiration?
(a) Breathing
(b) Diffusion of oxygen from blood to tissues
(c) Production of energy
(d) Diffusion of oxygen from tissues to blood
Answer
Answer: (a) Breathing
Question 2.
The atmosphere contains CO2 by volume
(a) 0.1%
(b) 0.5%
(c) 0.03%
(d) 0.3%
Answer
Answer: (c) 0.03%
Question 3.
Sudden deep inspiration is due to
(a) Increase in concentration of O2
(b) Increase in concentration of CO2
(c) Decrease in concentration of CO2
(d) Decrease in concentration of CO2
Answer
Answer: (b) Increase in concentration of CO2
Question 4.
A man respires about
(a) 40 times per minute
(b) 72 times per minute
(c) 12-16 times per minute
(d) 100 times per minute
Answer
Answer: (c) 12-16 times per minute
Question 5.
In which form CO2 is carried in blood
(a) Sodium bicarbonate
(b) Sodium carbonate
(c) Potassium bicarbonate
(d) Potassium carbonate
Answer
Answer: (d) Potassium carbonate
Question 6.
In man, gas exchange between the environment and the body takes place in
(a) Bronchi
(b) Larynx
(c) Alveoli
(d) Trachea
Answer
Answer: (c) Alveoli
Question 7.
Inspiration would not occur if the
(a) Diaphragm is elevated
(b) Diaphragm is lowered
(c) Ribs are elevated
(d) Ribs are elevated and diaphragm is lowered
Answer
Answer: (a) Diaphragm is elevated
Question 8.
Which one of the following does not contribute to the breathing movement in mammals?
(a) Abdominal muscles
(b) Larynx
(c) Ribs
(d) Diaphragm
Answer
Answer: (c) Ribs
Question 9.
Breathing centre that controls normal breathing in mammals lies in
(a) Mid brain
(b) Cerebellum
(c) Cerebrum
(d) Medulla oblongata
Answer
Answer: (a) Mid brain
Question 10.
If a person stays on hill for some days:
(a) His body will step up production of RBCs
(b) His body will step down production of RBCs
(c) His RBCs will turn into very large cells
(d) No change in the contents of RBCs in the body
Answer
Answer: (a) His body will step up production of RBCs
Question 11.
The largest quantity of air that can be expired after a maximal inspiratory effort is
(a) Tidal volume
(b) Vital capacity of lungs
(c) Lung volume
(d) Residual volume
Answer
Answer: (c) Lung volume
Question 12.
Which of the following facts suggests that O2 is transported from lungs to the tissues combined with haemoglobin rather than dissolved in blood plasma:
(a) Oxyhaemoglobin can dissociate into haemoglobin and O2
(b) An increase in CO2 concentration decreases the O2 affinity of haemoglobin
(c) Haehaemoglobin can combine with O2
(d) O2 carrying capacity of whole blood is higher than that of plasmsa and O2 content of blood leaving the lungs is greater than that of blood entering the lungs.
Answer
Answer: (d) O2 carrying capacity of whole blood is higher than that of plasma and O2 content of blood leaving the lungs is greater than that of blood entering the lungs.
Question 13.
If a man from sea coast of Mumbai goes to Mount Everest:
(a) His breathing rate and heart beat will increase
(b) His breathing rate and heart beat will decrease
(c) His breathing rate will increase, but heart beat will decrease
(d) His breathing rate will decrease, but heart beat will increase.
Answer
Answer: (a) His breathing rate and heart beat will increase
Question 14.
Body tissues obtain oxygen from oxyhaemoglobin because of its dissociation caused by
(a) Low CO2 concentration
(b) Low O2 and high CO3 concentration
(c) High CO2 concentration
(d) Low oxygen concentration
Answer
Answer: (b) Low O2 and high CO2 concentration
Question 15.
Lungs are covered by
(a) Perichondrium
(b) Pleura
(c) Periosteum
(d) Pericardium
Answer
Answer: (d) Pericardium
Question 16.
Tidal air is
(a) Total air taken into lungs
(b) Air that comes in and goes out in normal breathing
(c) Air inhaled in deep breathing
(d) Air expelled forcibly after normal inspiration
Answer
Answer: (b) Air that comes in and goes out in normal breathing
Question 17.
Lung lobes of human being are
(a) 2 left and 3 right
(b) 3 in each
(c) 2 in each
(d) 3 left and 2 right
Answer
Answer: (a) 2 left and 3 right
Question 18.
Body cavity is divided into thoracic
(a) Heart
(b) Liver
(c) Lungs
(d) Diaphragm
Answer
Answer: (d) Diaphragm
Question 19.
Breathing becomes faster in fever because
(a) Fever stimulates the respiratory centre of the man
(b) Oxygen carrying capacity of blood becomes lower
(c) Oxygen is used in fighting germs
(d) Increase in temperature increases metabolic rate requiring more oxygen
Answer
Answer: (d) Increase in temperature increases metabolic rate requiring more oxygen
Question 20.
Excess of water absorbed by human being is passed out in urine. Other sources is
(a) Inspiration
(b) Expiration
(c) Defaecation
(d) Salivation
Answer
Answer: (b) Expiration
Question 21.
Exchange of gases between the blood and the tissue of the body is called
(a) Internal respiration
(b) Cellular respiration
(c) External respiration
(d) Counter current exchange
Answer
Answer: (a) Internal respiration
Question 22.
Respiration involves in which following step:
(a) Transport of gases by the blood
(b) Diffusion of O2 and CO2 between the blood and the tissues
(c) Diffusion of gases (O2 and CO2) across alveolar membrane.
(d) All of these functions.
Answer
Answer: (d) All of these functions.
II. Fill in the blanks:
Question 1.
This process of exchange exchange of O2 from the atmosphere with CO2 produced by the cells is called …………… commonly known as …………….
Answer
Answer: breathing, respiration
Question 2.
…………… use their moist cuticle for respiration.
Answer
Answer: Earthworms
Question 3.
Among vertebrates, fishes respire through gills wheres ………….. and ………….. and ……………. use …………….
Answer
Answer: reptiles, birds, mammals, lungs
Question 4.
…………… like …………… can respire through their moist skin also.
Answer
Answer: Nasopharynsx, frogs
Question 5.
The nasal chamber opens into …………… which is a portion of pharyax, the common passage for ………….. and …………..
Answer
Answer: nasopharynx, food, air
Question 6.
Nasopharynx opens through glottis of the larynx region into the ……………..
Answer
Answer: trachea
Question 7.
The lungs are situated in the thoracic chamber which is anatomically an ………………
Answer
Answer: air-tight chamber
Question 8.
Breathing involves two stages: ……………… during which atmospheric air is drawn in and ……………. by which the alveolar air is released out.
Answer
Answer: inspiration, expiration
Question 9.
On an average, a healthy human respires …………….. times/minute.
Answer
Answer: 12-16
Question 10.
Total ……………. of air a person can inspire after a normal …………….
Answer
Answer: Volume, expiration
Question 11.
Volume of air that will remain in the ………… after a normal expiration. This includes ……………
Answer
Answer: lungs, ERV+RV
Question 12.
………….. and ……………. are exchanged in these sites by simple diffusion mainly based on pressure/concentration gradient.
Answer
Answer: O2, CO2
Question 13.
All the factors in our body are favourable for diffusion of ……………. from alveoli to tissues and that of …………… from tissues to alveoli.
Answer
Answer: O2, CO2
Question 14.
About ………….. of CO2 is carried in a dissolved state through ………….
Answer
Answer: 7 percent, plasma
Question 15.
O2 can bind with haemoglobin in a reversible manner to form ……………….
Answer
Answer: oxvhaemoglobin
III. Mark the statment True (T) or False (F)
Question 1.
Each haemoglobin molecule can carry a maximum of four molecules of O2.
Answer
Answer: True.
Question 2.
O2 is carried by haemoglobin as carbamino-haemoglobin (about 25-20 percent).
Answer
Answer: False.
Question 3.
Every 10 mL of oxygenated blood can deliver around 10 ml of O2 to the tissues under normal physiological conditions.
Answer
Answer: False
Question 4.
In the alveoli, where there is low pO2, high pCO2, higher H+ concentration and lesser temperature.
Answer
Answer: False
Question 5.
Every 100mL of deoxygenated blood delivers approximately 4 ml of CO2 to the alveoli.
Answer
Answer: True
Question 6.
The role of oxygen in the regulation of respiratory rhythm is quite insignificant.
Answer
Answer: True
Question 7.
Asthma is a difficulty in breathing causing wheezing due to inflammation of bronchi and bronchioles.
Answer
Answer: True
Question 8.
In certain industries, especially those involving grinding or stone¬breaking, so much dust is produced that the defence mechanism of the body cannot fully cope with.
Answer
Answer: True
Question 9.
Emphysema is a chronic disorder in which alveolar walls are damaged due to which respiratory surface is decreased. One of the major causes of this is cigarette smoking.
Answer
Answer: True
Question 10.
The first step in respiration is breathing by which atmospheric air is taken in and the alveolar air is released out.
Answer
Answer: True.
Question 11.
It is approx 800 ml., i.e., a healthy man can inspire or expire approximately 2000 to 8000 ml of air per minute.
Answer
Answer: False
Question 12.
Volume of air remaining in the lungs even after a forcible expiration. This averages-100 mL to 200 mL.
Answer
Answer: False
IV. Match the items in column I with Column II
| Column I | Column II |
| (a) Tidal volume | 1. averages 1000 ml to 1100 ml |
| (b) RV | 2. averages 2500 ml to 3000 ml |
| (c) ERV | 3. TV + IRV |
| (d) Inspiratory capacity | 4. approximately 6000 to 8000 ml of air per minute |
| (e) IRV | 5. averages 1100 ml to 1200 ml |
| (f) EC | 6. pO2 for oxygen and pCO2 for carbon dioxide |
| (g) FRC | 7. transported by RBC whereas 70 percent of it is carried as bicarbonate. |
| (h) Vital capacity | 8. TV + ERV |
| (i) Total lung Capacity | 9. transported by RBCs in the blood. |
| (j) Partial pressure | 10. for respiration |
| (k) About 97 percent of O2 is | 11. called lungs |
| (l) Nearly, 20-25 percent of CO2 is | 12. ERV + RV |
| (m) Gills | 13. This includes RV, ERV, TV and IRV |
| (n) Vascularised bags | 14. This includes ERV, TV and IRV |
| (o) Larynx is a cartilaginous box | 15. Sound box |
Answer
Answer:
| Column I | Column II |
| (a) Tidal volume | 4. approximately 6000 to 8000 ml of air per minute |
| (b) RV | 5. averages 1100 ml to 1200 ml |
| (c) ERV | 1. averages 1000 ml to 1100 ml |
| (d) Inspiratory capacity | 3. TV + IRV |
| (e) IRV | 2. averages 2500 ml to 3000 ml |
| (f) EC | 8. TV + ERV |
| (g) FRC | 12. ERV + RV |
| (h) Vital capacity | 14. This includes ERV, TV and IRV |
| (i) Total lung Capacity | 13. This includes RV, ERV, TV and IRV |
| (j) Partial pressure | 6. pO2 for oxygen and pCO2 for carbon dioxide |
| (k) About 97 percent of O2 is | 9. transported by RBCs in the blood. |
| (l) Nearly, 20-25 percent of CO2 is | 7. transported by RBC whereas 70 percent of it is carried as bicarbonate. |
| (m) Gills | 10. for respiration |
| (n) Vascularised bags | 11. called lungs |
| (o) Larynx is a cartilaginous box | 15. Sound box |
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