Respiratory System – Old Year Questions

1. Mammals respire by :

(a) Gills
(b) Trachea
(c) Skin
(d) Lungs

[M.P. P.C.S. (Pre) 2016]


2. The amount of which of the following components in the air does not change in the process of respiration?

(a) Carbon dioxide (CO2)
(b) Oxygen
(c) Water vapours
(d) Nitrogen

[R.A.S./R.T.S. (Pre) 2003]


3. Oxygen transportation in a human body takes place through :

1. Blood
2. Lungs
3. Tissue
The correct sequence of transportation is :

(a) 1, 2, 3
(b) 3, 1, 2
(c) 2, 1, 3
(d) 1, 3, 2

[I.A.S. (Pre) 1997]


4. Site of gaseous exchange in lungs is :

(a) Tracheoles
(b) Bronchioles
(c) Pulmonary vein
(d) Alveoli

[U.P. P.C.S. (Pre) 2021]


5. When there is a decrease in the concentration of oxygen in the blood, the rate of breathing :

(a) Decreases
(b) Increases
(c) Does not change
(d) First decreases, then increases

[U.P.P.C.S. (Pre) 2000]


6. Carbon monoxide poisoning affects mainly which one of the following?

(a) Digestive activity
(b) Liver functioning
(c) Kidney functioning
(d) Oxygen carrying capacity of blood

[M.P.P.C.S. (Pre) 2012]


7. Which one of the following biotransformations provides maximum energy to the human body?

(a) ADP ĺ AMP
(b) ATP ĺ ADP
(c) ADP ĺ ATP
(d) AMP ĺ ADP

[U.P.P.C.S. (Mains) 2015]

8. During respiration energy is produced in the form of :

(a) ADP
(b) ATP
(c) NADP
(d) CO2

[U.P. P.C.S. (Mains) 2016]


9. The complete conversion of glucose, in the presence of oxygen, into carbon dioxide and water with release of energy is called :

(a) Aerobic respiration
(b) Anaerobic respiration
(c) Glycolysis
(d) Hydrolysis

[I.A.S. (Pre) 1998]


10. Which part of human body maintains the body temperature?

(a) Heart
(b) Lungs
(c) Liver
(d) Kidney

[M.P.P.C.S. (Pre) 1991]