NCERT Breathing Exchange Gases model,mock,sample exam,mcq NEET
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Breathing and Exchange of Gases Mock Test-9

Question No:1

Bulk of carbon dioxide (CO2) released from body tissues into blood is present as

[A] bicarbonate in blood plasma and RBCs
[B] free CO2 in blood plasma
[C] 70% Carbaminohaemoglobin and 30% as bicarbonate
[D] Carbaminohaemoglobin in RBCs



Question No:2

How Q2 and CO, gets transported through blood?

[A] with the help of RBCs and blood plasma
[B] with the help of RBCs and WBCs
[C] with the help of WBCs and blood serum
[D] with the help of platelets and corpuscles



Question No:3

During oxygen transport the oxyhaemoglobin at the tissue level liberates oxygen to the cells because in tissue

[A] O2 concentration is high and CO2 is low
[B] O2 concentration is low and CO2 is also low
[C] O2 tension is high and CO2tension is low
[D] O2 tension is low and CO2 tension is high



Question No:4

The blood leaving the lungs has all its hemoglobin oxygenated and gives up oxygen to the tissues because

[A] the tissue can absorb O2 from oxyhaemoglobin
[B] O2 concentration in tissues is lower and CO2 concentration is higher as compared to lungs
[C] O2 concentration in tissues is higher and CO2 concentration is lower as compared to lungs
[D] oxyhaemoglobin undergoes reduction



Question No:5

During one circuit of blood from lungs to the tissues and back through circulatory system, the percentage of haemoglobin giving up its oxygen to tissues is

[A] 25%
[B] 50%
[C] 75%
[D] 100%



Question No:6

Assertion: Fishes use tracheal tubes for respiration.
Reason: Fishes are amphibian.

[A] If both the assertion and the reason are true and the reason is a correct explanation of the assertion
[B] If both the assertion and reason are true but the reason is not a correct explanation of the assertion
[C] If the assertion is true but the reason is false
[D] If both the assertion and reason are false



Question No:7

Assertion: Humans can directly alter the pulmonary volume without change in the volume of thoracic cavity.
Reason: Our lungs are inelastic.

[A] If both the assertion and the reason are true and the reason is a correct explanation of the assertion
[B] If both the assertion and reason are true but the reason is not a correct explanation of the assertion
[C] If the assertion is true but the reason is false
[D] If both the assertion and reason are false



Question No:8

Assertion: We have the ability to increase the strength of inspiration and expiration.
Reason: We have some vestigeal abdominal muscles.

[A] If both the assertion and the reason are true and the reason is a correct explanation of the assertion
[B] If both the assertion and reason are true but the reason is not a correct explanation of the assertion
[C] If the assertion is true but the reason is false
[D] If both the assertion and reason are false



Question No:9

Assertion: During inspiration, pressure of air falls in the thorax.
Reason: There is a rise in volume of thorax during inspiration.

[A] If both the assertion and the reason are true and the reason is a correct explanation of the assertion
[B] If both the assertion and reason are true but the reason is not a correct explanation of the assertion
[C] If the assertion is true but the reason is false
[D] If both the assertion and reason are false



Question No:10

Assertion: During inspiration, the volume of thorax increases.
Reason: This happens due to the relaxation of diaphragm and inspiratory muscles.

[A] If both the assertion and the reason are true and the reason is a correct explanation of the assertion
[B] If both the assertion and reason are true but the reason is not a correct explanation of the assertion
[C] If the assertion is true but the reason is false
[D] If both the assertion and reason are false



Question No:11

Assertion: Forceful expiration occurs through expiratory muscles.
Reason: Expiratory muscles expires quickly.

[A] If both the assertion and the reason are true and the reason is a correct explanation of the assertion
[B] If both the assertion and reason are true but the reason is not a correct explanation of the assertion
[C] If the assertion is true but the reason is false
[D] If both the assertion and reason are false



Question No:12

Assertion: Vital capacity is higher in athletes than non-athletes.
Reason: Vital capacity is about 3.5—4.5 litres in a normal adult person.

[A] If both the assertion and the reason are true and the reason is a correct explanation of the assertion
[B] If both the assertion and reason are true but the reason is not a correct explanation of the assertion
[C] If the assertion is true but the reason is false
[D] If both the assertion and reason are false



Question No:13

Assertion: 70 % of CO, is carried as bicarbonate ion in plasma.
Reason: If it transported directly th pH of blood become acidic.

[A] If both the assertion and the reason are true and the reason is a correct explanation of the assertion
[B] If both the assertion and reason are true but the reason is not a correct explanation of the assertion
[C] If the assertion is true but the reason is false
[D] If both the assertion and reason are false



Question No:14

Assertion: In mammals, complex respiratory system has developed.
Reason: Mammalian skin is impermeable to gases.

[A] If both the assertion and the reason are true and the reason is a correct explanation of the assertion
[B] If both the assertion and reason are true but the reason is not a correct explanation of the assertion
[C] If the assertion is true but the reason is false
[D] If both the assertion and reason are false



Question No:15

Assertion: Emphysema is chronic disorder.
Reason: One of the major cause of emphysema is cigarette smoking.

[A] If both the assertion and the reason are true and the reason is a correct explanation of the assertion
[B] If both the assertion and reason are true but the reason is not a correct explanation of the assertion
[C] If the assertion is true but the reason is false
[D] If both the assertion and reason are false