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Breathing and exchange of gases - Question framed directly from the lines of NCERT

A person suffers punctures in his chest cavity in an accident without any damage to the lungs. Its effect could be

4 points

a. Reduced breathing rate

b. Rapid increase in breathing rate

c. No change in respiration

d. Cessation of breathing

Clear selection

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

4 points

a. It reduces CO2 transport

b. It reduces O2 transport

c. It increases CO2 transport

d. It increases O2 transpor

Clear selection

Which is the correct sequence of air passage during inhalation?

4 points

(a) Nostrils → larynx → pharynx → trachea → lungs

(b) Nasal passage → trachea → pharynx → larynx → alveoli

(d) Nostrils → pharynx → larynx → trachea → alveoli

Clear selection

4 points

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

Clear selection

Mark the true statement among the following with reference to normal breathing

4 points

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

Clear selection

4 points

(a) (i) and (iv)

(b) (ii) and (iii)

(d) (ii) and (iv)

Clear selection

Respiration in insects is called direct because

4 points

a. The cell 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

Clear selection

Respiratory process is regulated by certain specialized centres in thebrain. One of the following centres can reduce the inspiratory durationupon stimulation

4 points

a. Medullary inspiratory centre

b. Pneumotaxic centre

c. Apneustic centre

d. Chemosensitive centre

Clear selection

CO2 dissociates from carbaminohaemoglobin when

4 points

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

Clear selection

Regarding the functions of our respiratory system, mark the wrong entry.

4 points

a. Humidifies the air

b. Warms up the air

c. Exchange of gases

d. Cleans up the air

Clear selection

The oxygen - haemoglobin dissociation curve will show a right shift in case of

4 points

a. High pCO2

b. High pO2

c. Low pCO2

d. Less H+ concentration

Clear selection

A person breathes in some volume of air by forced inspiration after having a forced expiration. This quantity of air taken in is

4 points

a. Total lung capacity

b. Tidal volume

c. Vital capacity

d. Inspiratory capacity

Clear selection

During respiration exchange of gases take place in

4 points

(a) trachea and larynx

(b) alveoli of lungs

(d) throat and larynx

Clear selection

From the following relationships between respiratory volume andcapacities and mark the correct answer: (i) Inspiratory capacity (IC) = Tidal Volume + Residual Volume (ii) Vital Capacity (VC) = Tidal Volume (TV) + Inspiratory ReserveVolume (IRV) + Expiratory Reserve Volume (ERV). (iii) Residual Volume (RV) = Vital Capacity (VC) – Inspiratory ReserveVolume (IRV). (iv) Tidal Volume (TV) = Inspiratory Capacity (IC) – Inspiratory ReserveVolume (IRV)

4 points

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

Clear selection

Incidence of Emphysema – a respiratory disorder is high in cigarette smokers. In such cases

4 points

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

Clear selection

Mark the incorrect statement in context to O2 binding to Hb

4 points

a. Higher pH

b. Lower temperature

c. Lower pCO2

d. Higher pO2

Clear selection

In breathing movements, air volume can be estimated by

4 points

a. Stethoscope

b. Hygrometer

c. Sphigmomanometer

d. Spirometer

Clear selection

Which of the following statements is incorrect regarding respiratory system?

4 points

a. Each terminal bronchiole give rise to a network of bronchi.

b. the alveoli are highly vascularised.

c. The lungs are covered by a double-layered membrane.

d. The plecral fluid reduces friction on the lung surface.

Clear selection

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