NCERT Breathing Exchange Gases sample,model,mock exam,mcqs NEET

Breathing and Exchange of Gases Mock Test-6

Question No:1

Blood transport of occurs CO2 in three forms. The correct percentages of CO2 in these forms are As
Carbaminohaemoglobin in RBC — As bicarbonates—-Dissolved form in plasma

[A] 20-25%– 70% — 7%
[B] 7% –20-25% — 70%
[C] 20-25%– 7% — 70%
[D] 70% –20-25% — 7%



Question No:2

Each molecule of hemoglobin can carry at the maximum ____ molecules of O2

[A] 1
[B] 2
[C] 3
[D] 4



Question No:3

Under a given oxygen concentration in blood, dissociation of oxyhaemoglobin will increase if

[A] pH of blood falls
[B] pH of blood rises
[C] CO2 concentration in blood falls
[D] Free fatty acid concentration in blood falls



Question No:4

The blood coming out of lungs is richer than that one entering into lungs in

[A] CO2
[B] O2
[C] Both
[D] None



Question No:5

When partial pressure of CO2 (pCO2) rises, the oxygen dissociation curve of hemoglobin at 37&8451; will

[A] shift towards right
[B] shift towards left
[C] become irregular
[D] remain unchanged



Question No:6

Dissociation curve is connected with

[A] Myoglobin
[B] CO
[C] O2
[D] oxyhaemoglobin



Question No:7

A large proportion of oxygen is left unused in the human blood even after uptake by the body tissue. This oxygen

[A] Is enough to keep oxyhaemoglobin saturation at 96%
[B] Helps in releasing more oxygen to epithelial tissues
[C] Acts as reserve during muscular exercise
[D] Raise pCO2 of blood to 75 mmHg



Question No:8

Oxygen dissociation curve is

[A] parabola
[B] sigmoid
[C] hyperbola
[D] straight line



Question No:9

Binding of oxygen with hemoglobin can be affected by

[A] pCO2
[B] H+ conc
[C] Temperature
[D] All



Question No:10

Amount of O2 normally carried by 100 ml, of pure blood

[A] 10ml
[B] 20ml
[C] 5ml
[D] 4ml



Question No:11

How much oxygen is delivered to tissue by 100 ml of oxygenated blood under normal physiological condition?

[A] 10ml
[B] 20ml
[C] 5ml
[D] 4ml



Question No:12

How much carbon dioxide is delivered to alveoli by 100 ml of deoxygenated blood under normal physiological condition?

[A] 10ml
[B] 20ml
[C] 5 ml
[D] 4ml



Question No:13

Oxygen binding to haemoglobin is

[A] Directly proportional to CO2 concentration
[B] Directly proportional to CO concentration
[C] Inversely proportional to CO2 concentration
[D] Independent of CO concentration



Question No:14

The most characteristic feature of haemoglobin is

[A] its red colour
[B] presence of iron
[C] its ability to combine reversibly with oxygen
[D] presence of basic protein globin



Question No:15

Factors at tissue level favours dissociation of oxygen from oxyhemoglobin

[A] low pO2, low pCO2, high H+, low temperature
[B] high pO2, high pCO2, low H+, high temperature
[C] low pO2, high pCO2, high H+, high temperature
[D] low pO2, high pCO2, high H+, low temperature