NCERT Class 11-Biology: Chapter – 17 Breathing and Exchange of Gases Part 1 (For CBSE, ICSE, IAS, NET, NRA 2022)

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Multiple Choice Questions

Question 1:

Respiration in insects is called direct because

a. The tissues exchange directly with the air in the tubes

b. The tissues exchange directly with coelomic fluid

c. The tissues exchange directly with the air outside through body surface

d. Tracheal tubes exchange directly with the haemocoel which then exchange with tissues

Answer: (d)

Question 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

Answer: (d)

Question 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

Answer: (d)

Question 4:

It is known that exposure to carbon monoxide is harmful to animals because

a. It reduces transport

b. It reduces transport

c. It increases transport

d. It destroys haemoglobin

Answer: (d)

Question 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

Answer: (b)

Question 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

Answer: (a)

Question 7:

Mark the incorrect statement in context to binding to

a. Higher

b. Lower temperature

c. Lower

d. Higher

Answer: (d)

Question 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

Answer: (d)

Question 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

Answer: (b)