MCQ Questions for Class 11 Biology Chapter 17 Breathing and Exchange of Gases with Answers

Solving the Breathing and Exchange of Gases Multiple Choice Questions of Class 11 Biology Chapter 17 MCQ can be of extreme help as you will be aware of all the concepts. These MCQ Questions on Breathing and Exchange of Gases Class 11 with answers pave for a quick revision of the Chapter thereby helping you to enhance subject knowledge. Have a glance at the MCQ of Chapter 17 Biology Class 11 and cross-check your answers during preparation.

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 IColumn II
(a) Tidal volume1. averages 1000 ml to 1100 ml
(b) RV2. averages 2500 ml to 3000 ml
(c) ERV3. TV + IRV
(d) Inspiratory capacity4. approximately 6000 to 8000 ml of air per minute
(e) IRV5. averages 1100 ml to 1200 ml
(f) EC6. pO2 for oxygen and pCO2 for carbon dioxide
(g) FRC7. transported by RBC whereas 70 percent of it is carried as bicarbonate.
(h) Vital capacity8. TV + ERV
(i) Total lung Capacity9. transported by RBCs in the blood.
(j) Partial pressure10. for respiration
(k) About 97 percent of O2 is11. called lungs
(l) Nearly, 20-25 percent of CO2 is12. ERV + RV
(m) Gills13. This includes RV, ERV, TV and IRV
(n) Vascularised bags14. This includes ERV, TV and IRV
(o) Larynx is a cartilaginous box15. Sound box
Answer

Answer:

Column IColumn II
(a) Tidal volume4. approximately 6000 to 8000 ml of air per minute
(b) RV5. averages 1100 ml to 1200 ml
(c) ERV1. averages 1000 ml to 1100 ml
(d) Inspiratory capacity3. TV + IRV
(e) IRV2. averages 2500 ml to 3000 ml
(f) EC8. TV + ERV
(g) FRC12. ERV + RV
(h) Vital capacity14. This includes ERV, TV and IRV
(i) Total lung Capacity13. This includes RV, ERV, TV and IRV
(j) Partial pressure6. pO2 for oxygen and pCO2 for carbon dioxide
(k) About 97 percent of O2 is9. transported by RBCs in the blood.
(l) Nearly, 20-25 percent of CO2 is7. transported by RBC whereas 70 percent of it is carried as bicarbonate.
(m) Gills10. for respiration
(n) Vascularised bags11. called lungs
(o) Larynx is a cartilaginous box15. Sound box

 


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